Doctor Who
The Baker Era
Season 12
Robot
Space Station
The Ark in Space
The Sea of Fear
The Sontaran Experiment
Genesis of the Daleks
Revenge of the Cybermen
"Robot" had Tom Baker convince Barry Letts that it would be a great idea for the robot to sing "There's An Old Mill by the Breeze", as the actor, Michael Kilgarriff, had a lot of knowledge of music hall songs. The robot is commanded to sing in the section.
"Space Station" by Christopher Langley is set on a far-future space station during a period when mankind is no longer living on Earth. Leads into the Ark in Space.
"The Ark in Space" concerns a massive space ark carrying cryogenically-frozen humans, which has been invaded by the Delc. The Delc are fungi, grown from spores floating in space. The primary Delc take the form of floating heads, while their servitors appear as headless bodies. The Delc are impervious to most harm because any impact just causes the release of more spores. Fortunately, the Doctor eventually discovers that the Delc are susceptible to electrocution, and ultimately knocks the primary Delc out into space with a golf club. The character Vira is black and possibly Haitian(originally intended).
"The Sea of Fear" by Brian Hayles. The TARDIS lands on an island where the ape-like Simiads and the amphibious Zelons are at war. The conflict is being provoked by technicians from Research Inc under the command of Director Korbyn. Research Inc has travelled back in time from Earth City in the far future in order to determine which of the two races is an ancestor of Man. Once this is known, any denizens of Earth City who manifest the other race's lineage will be purged under the orders of the Great Leader. But the Great Leader knows that he is of Simiad strain and has planted an agent, Dr. Rojel, amongst the Research Inc staff to tip the scales against the Zelons. However, the Doctor discovers that pollution from the Research Inc facility is having a degenerative effect on the Simiads — which Korbyn tries to cover up by activing a self-destruct mechanism. The Doctor stops him by using the TARDIS to scramble the signal, and reveals that the Simiads and Zelons are actually two forms of the same race.
"The Sontaran Experiment" was set in the future, an idea of Bob Baker and Dave Martin was to incorporate some relics of human civilisation to imply that the story was actually set where London had once stood — for instance, by having the top of Nelson's column poking up out of the ground in homage to
Planet of the Apes (1968). A subplot that revealed Styre was controlling Vural's mind was kept in.
"Genesis of the Daleks" originally had an idea by Terry Nation that was rejected due to being too similar to earlier Dalek Stories. Terrence Dicks suggested doing a Dalek origin story. The Doctor's meeting with the Time Lord takes place in a lush garden. The role of a Kaled officer named General Greiner was kept(OTL it was replaced by Ravon) while Sevrin was paired with a second Muto named Marrass. Terry Nation had the Mutos be much more bestial in appearance, their forms usually hidden by their rags. Episode three contained a subplot where Sarah contracts radiation poisoning, a nod to a similar story strand in "The Daleks". Episode five has more action in the Dalek incubator room and ended with the Doctor's question of whether he had the right to destroy them. The Thal soldiers are originally boys aged 15 or 16 to illustrate the youth of those fighting in the war.
"Revenge of the Cybermen" follows Gerry Davis's original script with space station Nerva as a sort of galactic service station with a casino, whose gold is used against the Cybermen. Most of the action took place on board the Nerva beacon. The Nerva crew included a scientist named Anitra Berglund, and Warner(Female ITTL). The Cybermen have been smuggled onto Nerva by Kellman before the story begins, with the aim of destroying a gold-rich asteroid in the station's vicinity. Kellman has betrayed a group of miners (led by a man named Evans, and also including Jones and Williams) who have been marooned on the asteroid for a quarter of a century; they eventually kill him by dynamiting a tunnel. The Doctor manages to reprogram the Cybermats to destroy the Cybermen using gold dust he has retrieved from the asteroid. The Cybermen appear much earlier, explaining the presence of the Cybermats on the Beacon(OTL they do not arrive until the end of Part Two, so how the Cybermats got onto the Beacon is never explained). Cybermen costumes from "The Invasion" were used(OTL only two suits had survived and in poor condition). Realizing the old and outdated versions of the suits were impractical, the BBC wished to create new ones. The Original Star Trek Series had ended its 5 years Mission and had a large budget in its own right, more than Doctor Who, so a second crossover was proposed in which the Cybermen would be the antagonists, created by the Star Trek team. Star Trek having been finished meant the Crossover would be entirely a Doctor Who story, plus the BBC would get to keep the Cybermen suits.
Season 13
Terror of the Zygons
the Angarath
Planet of Evil
Pyramid of Mars
The Android Invasion
The Eyes of Nemesis
Fires of the Starmind
The Menday Fault
The Brain of Morbius
The Seeds of Doom
"Terror of the Zygons" placed a far greater emphasis on the Skarasen and the loch.
"The Angarath" by Eric Pringle. Concerned a race of people offering human sacrifices to sentient rocks.
"Planet of Evil"has Sorenson dying after falling into the pit, though Sorenson was seen as a victim of the planet's influence rather than an evil man in himself.
"Pyramids of Mars" follows Griefer's original script where the Doctor and his companion attend a conference on food reserves at the British Museum, along with The Brigadier (who it was suggested might be killed off during the adventure). The Doctor's friend Professor Fawzi and his partner, Dr. Robertson, are there to unveil their work on a new type of grain which can flourish on the surface of the Moon, thereby solving the world's hunger problems. However, the conference is soon attacked by the crocodile-like Egyptian god Sebek and his army of mummies. Sebek and his master, Seth, are aliens who came to Earth millennia ago intent on conquest, but were placed in suspended animation via a powerful artifact called the Eye wielded by Horus, another of their kind. Having reawakened, they now intend to replace Fawzi and Robertson's grain with one which will result in the Moon's disintegration — which, in turn, will have catastrophic effects on Earth. The Doctor manages to locate Seth's resting place beneath an Egyptian pyramid, and is assisted by Horus and another deity, Isis, in defeating Seth and destroying the probe in mid-flight. Ernie Clements survives the story.
"The Android Invasion" The Brigadier appears in this story, replacing Colonel Farraday. A key plot element is that the Kraal androids were in fact mirror images of the people they were imitating, and this was how the Doctor deduced that “Sarah Jane” was actually a robot. Terry Nation had the Kraals be somewhat insectoid in appearance. Harry died saving Sarah.
"The Eyes of Nemesis" by Brian Hayles. On an alien planet, an old beggar named Lakdem is pursued by Myrron androids, but is immune to their destructive weaponry. The TARDIS materialises, and the Doctor is captured by the Myrron commander, Torr. Sarah takes Lakdem back to the TARDIS, where he sheds his skin to become a younger man. Together, they rescue the Doctor and Lakdem sets the coordinates to take the TARDIS to his planet of origin, the secret world of Oinos. There, he reveals that he is also an android originally created by the Kraals: one of Thirteen Watchers tasked by Death and infused with awesome power to wander the universe and observe its progress. However, Torr has tracked the TARDIS to Oinos and reveals that he serves the Celestial Toymaker, who desires Death's power for himself. The Doctor challenges the Toymaker, and the distraction allows Lakdem to accelerate time around the Myrrons, destroying them utterly.
"Fires of the Starmind" by Marc Platt. Information in the Time Lord libraries is stored on photons. A sentient star uses this as a means of invading Gallifrey.
"The Menday Fault" by David Wiltshire. The Doctor and Sarah Jane join the crew of the
Thor, an experimental nuclear submarine attempting to set a new depth record by entering the Fault of Menday in the Bermuda Triangle. The Fault turns out to be a passageway to a subterranean world, and the
Thor is captured by a race called the Suranians, led by Zorr. The Suranians' world is lit by a glowing cloud of gas that is beginning to fade, and so Zorr wants to use the Polaris missiles aboard the
Thor to invade the surface world. He threatens Sarah's life to force the Doctor's cooperation, but she is saved by Nephus, a merman-like Trelw. Nephus' people are being mind-controlled by the Suranians, but the Doctor manages to destroy the transmitter, inciting a rebellion. Nephus kills Zorr, and the
Thor is able to the return to the surface world.
"The Brain of Morbius" is the Terrance Dicks' version, which involves a space criminal called Morbius crash-landing onto a planet, and his robot servant — who lacks any sense of aesthetics — assembling a new body for him from other aliens, in ignorance of their vastly differing physiognomies. Dicks drew partly upon the costumes for the Clawrantulars, creatures which had appeared in
Seven Keys to Doomsday, for the crab-like elements of Morbius' new body.
"The Seeds of Doom"brings the Brigadier and Benton back for the final episode.
Season 14
The Hand of fear
The Dreamers of Phados
The Face of Evil
The Talons of Weng-Chiang
When Sarah Jane Smith's actress Elisabeth Sladen was ready to leave the show, one proposed idea for her departure was to have her Killed Off for Real as the Sudden Downer Ending of a serial. A seemingly dead enemy would have managed to shoot her, with the Doctor breaking down and embracing her body upon realizing what happened. The last scene would have taken place the next morning, with other characters seeing her funeral pyre burning just as the TARDIS was dematerialising.
"The Hand of Fear" has the original outline set in the 1990s, at a time when technology and the military are forbidden. Sarah is sent to live in a commune while the Doctor is despatched to a labour camp. There he meets the aged Brigadier — now part of EXIT, the Extraterrestrial Xenological Intelligence Taskforce — and discovers that an anthropologist named Mountford has unearthed a mysterious fossilised hand. The hand takes control of Mountford's mind and forces him to transport it to the Nuton nuclear reactor, which is in the process of being decommissioned. There, the radiation allows the hand to regenerate into its original form: a creature called an Omegan made of teryllium, which has travelled to Earth from inside a black hole. It transpires that there are actually two Omegans at work on Earth, representing different factions of their people. The “hawk” Omegans wish to destroy humanity, while the “dove” Omegans simply want to remove mankind as an interstellar threat. They have accomplished this by slowly devolving men into ape-like Trogs, which manifested itself early on as the backlash against science. Sarah is now undergoing the same transformation. This is undone, however, when the “hawk” Omegan (who crashlanded on Earth, necessitating his reconstitution at Nuton) destroys his “dove” counterpart. He then flees Earth in the other Omegan's spaceship, having configured Nuton to explode and obliterate the planet. At the last second, the Doctor manages to redirect the power of the blast to fuel an experimental rocket called the Icarus. Brigadier Lethbridge Stewart commandeers the Icarus and uses it to pursue the Omegan, ultimately sacrificing himself by ramming the enemy vessel head-on, preventing it from impacting with the Earth. The Episode also includes key character, Lieutenant Hawker. Along with the calcified hand, an Omegan spaceship (referred to as “the Monolith”) is discovered at the start of episode one, and became central to the storyline, serving as the location of the adventure's climax. The separate factions of Omegans were excised. Baker and Martin also introduced a new supporting character, in the form of a Time Lord named Drax. An untrustworthy Gallifreyan mechanic who wants to steal the TARDIS. Drax became a possible recurring character.
"The Dreamers of Phados" by Chris Boucher. Set on a colony ship which has been home to a civilisation spanning many generations.
"The Face of Evil" has Tomas named Loke and has a more prominent role though Leela still gets more focus.
"The Talons of Weng-Chiang" reveals The true identity of Weng-Chiang as the desiccated, decomposing Master, this justifies the time cabinet and the plan to restore himself through the life energy of others.
Season 15
Horror of Fang Rock
The Invisible Enemy.
Image of the Fendahl
The Sun Makers
Killers of the Dark
The Krikkitmen
Invasion of Time
"Horror of Fang Rock" This story, the Season 15 opener, was written as a replacement for a vampire-based story by the same writer called "The Vampire Mutations" because the BBC's classic serial adaptation of
Dracula was set to air in 1977 and they thought
Who doing a similar story would take the shine off of it. The Vampire mutations would be released later.
"The Invisible Enemy" has K-9 depart with the Doctor and Leela.
"Image of the Fendahl" has Max Stael shoot himself on-camera.
"The Sun Makers" has The Collector as a large, corpulent figure, which is why Hade calls him things like "Your Immensity". Director Pennant Roberts had the giant credit cards featured in the story resemble Barclaycards. Veet's lines instead go to a character named Rashif.
Scenes from the Episode depicting the race of Cat People.
"Killers of the Dark", by David Weir. Concerned a race of cat people originally native to Gallifrey(OTL this was an idea cut due to going over the budget, with a scene involving a giant stadium full of cat people often cited. The show's bigger budget allows it to be made and it leads into the Season Finale in which the Time Lords are revealed to not be originally from Gallifrey).
Title Card for the Krikkitmen
"The Krikkitmen" by Douglas Adams. Two million years ago, the inhabitants of the planet Krikkit built a race of androids called the Krikkitmen to wipe out all life in the universe. They were stopped by the Time Lords, who trapped Krikkit within a temporal prison. Now, however, a group of Krikkitmen which escaped the Time Lords' sentence are trying to reassemble the components of a key which can free Krikkit — components of which happen to resemble elements of the Earth game of cricket, itself actually a reflection ro the ancient war. The Doctor and Sarah stumble upon this plot when they see the Krikkitmen steal the Ashes during a test match at Lords. They then travel to the planet Bethselamin to foil the next step in the Krikkitmen's quest. This idea was later revived in Adams' third
Hitchhiker's Guide to the Galaxy book,
Life, the Universe and Everything, which crossed over with Doctor Who later on when it received a Television adaptation with the idea being that several Krikkitmen split off, one group being defeated in
Hitchhiker's and the other in
Doctor Who.
"The Invasion of Time" kills off Leela, who dies defending the Doctor from the Sontarans. The story was written by Robert Holmes. It was revealed that the Time Lords were not native Gallifreyans, but rather had been permitted to construct their Citadel there in return for ensuring that the planet's populace lived in total comfort and security. It was these indigenous Gallifreyans that Leela met following her banishment. The Doctor's actions as President threw the Time Lords into open civil war, and part two ended with several rebellious Time Lords threatening to execute the Doctor. The Vardans also betrayed the Doctor, ordering his annihilation at the close of episode three. After Leela's departure, Elisabeth Sladen was approached to return to the series as Sarah Jane. However, she declined, and thus Romana was created instead.
Season 16
The Ribos Operation
The Pirate Planet
The Stones of Blood
The Androids of Tara
Shield of Zarak
The Armageddon Factor
"The Ribos Operation" has the jethrik as being more important because its actually a source of incredible energy which could power a fleet of spaceships.
"The Pirate Planet" followed Douglas Adams' original outline, which involved a planet which is being mined by the Time Lords, who use a giant aggression-sapping machine (disguised as a statue) to pacify the natives. One Time Lord (stuck in the slow-time field, in the midst of his last regeneration) becomes trapped in the statue and absorbs all the aggression, inducing him to turn against his people. He causes the mining devices to hollow out the planet and now plans to make it dematerialise and reform around Gallifrey. Adams uses a drug addiction allegory, about a company which preys on people who fear death by offering machines which can slow time for them — but at an exorbitant price. The company goes bankrupt, however, leaving one old lady in need of a source of fantastic energy.
"The Stones of Blood" The Ogri(the stone creatures worshipped in "The Angarath) return, revealed to rocky-skinned humanoids who looked like regular stones only when stationary. The Ogri simply crush people. The Megara are depicted as floating metal orbs.
"The Androids of Tara" by David Fisher has Tara populated by animals resembling creatures of legend, such as unicorns (which might be natural or mechanical), and has Till as a dwarf rather than a hunchback.
"Shield of Zarak", aka "The Doppelgangers" or "Shield of Zareg", by Ted Lewis. Dealt with the notion that legendary heroes might, in reality, have been the antithesis of the way history would ultimately portray them. Apparently, the specific example planned was to have the Doctor and Romana encounter Robin Hood in their search for the fourth segment of the Key to Time, only to discover that the alleged hero was actually a blackhearted villain. Lewis was unfamiliar with
Doctor Who and it was clear that the scripts needed work. He had also begun a descent into alcoholism amidst marital difficulties, and was drunk when he met with Graham Williams and Anthony Read to discuss the script. Fortunately he sobered dup by the next meeting and the idea was refreshed into a more suitable format.
"The Armageddon Factor" has the reappearance of Drax, this time becoming an elderly eccentric similar to the aged prisoner from
The Count of Monte Cristo. Both Atrios and Zeos are populated. Astra (originally “Reina”, a name later changed to avoid confusion with Prince Reynart from "The Androids of Tara") was an astrophysicist who had discovered the Shadow's planet lying between the two warring worlds. The conflict had arisen because Atrios and Zeos blamed each other for a catastrophic shift in their orbits; they were being egged on by the Shadow, known as “the Presence” on Atrios and “the Voice” on Zeos. The Doctor was forced to use the makeshift Key To Time to temporally freeze both planets' armies. The Shadow's own shadow turned out to be the sixth segment of the Key To Time. His plan was to use the powers of the Key to pit one half of the universe in war against the other half. The Doctor stopped the Shadow by unfreezing the Atrian and Zeon armies and giving each the coordinates of the Shadow's “Castle of Evil”. The Black Guardian is not yet introduced, the Doctor simply decided that he did not trust the White Guardian with the Key, and consequently scattered the six segments again to prevent anyone from controlling it. This was changed when the actor couldn't reprise his role.
Season 17
Destiny of the Daleks
The Doomsday Contract
Erinella
The Tearing of the Veil
the Valley of the Lost
City of Death
The Gamble of Time
The Creature from the Pit
Shada
Graham Williams and Douglas Adams seriously considered having Romana be played by a different actress in every story in Season 17, before deciding that it would be too much work and too stressful on the writers. Romana was written into a scene in which she was injured and regenerated.
"Destiny of the Daleks" takes place mostly at night. K-9 was trapped in the TARDIS due to a rockfall, while the Daleks searched for Davros because he can supply information about special circuitry which will help them break the deadlock.
"The Doomsday Contract", aka "Shylock", by John Lloyd. While vacationing on Cimmerian II, the Doctor is summoned before the Altribunal of Coelare Coelum, an intergalactic court. He has been called as a witness in a millennia-old case in which the Plenum Trust Corporation (whose Executive Vice President, Smilax, is an old friend) is opposing the purchase of the Earth by Cosmegalon and its unscrupulous owner, Jugend Bruisa. Plenum had been testing the Spondilas Chamber — an incredibly powerful device capable of polymorphing matter — when Cosmegalon bought the Earth via dubious means. Now Smilax fears that Chamber falling into Bruisa's hands. In court, the Doctor gives evidence that the Earth is home to intelligent life, which by law would nullify Cosmegalon's ownership. He is sent to Earth to retrieve a human as proof. Arriving in mediaeval Yorkshire, the Doctor is prevented from completing his task by the monstrous Children of Pyxis, who have been despatched by Cosmegalon. Fortunately, he is saved from death by the timely intervention of Smilax, and does manage to spirit away the Spondilas Chamber. Nonetheless, with the Doctor having seemingly failed, the court rules in Cosmegalon's favour. However, the Doctor tricks Bruisa and the Children of Pyxis into travelling to modern-day Earth near a missile base, where their ship is annihilated.
"Erinella", aka "Dragons of Fear", by Pennant Roberts. The Doctor, Romana and K9 arrive on the planet Erinella. There, the Doctor is immediately arrested and accused of poisoning a local noble. Indeed, everyone seems to recognise him, despite the fact that he's never been to Erinella before. Romana and K9 retreat to the woods where they meet Og, the keeper of Erinella's dragons. Meanwhile, the Doctor discovers that the true murderer is a Queen who is scheming to control all of Erinella. Moreover, he has accidentally arrived on the planet later than he was meant to. He escapes and travels back in time to set in motion the events that he has already witnessed. Romana convinces Og to send the dragons against the Queen, while the Doctor tricks her into confessing her crimes.
"The Tearing of the Veil" by Alan Drury. An evil force pursues the TARDIS to a Victorian vicarage, where the vicar's widow is being defrauded by phoney spiritualists. As supernatural phenomena grip the vicarage, the con artists are killed off one by one. Even K9 is apparently torn apart by a poltergeist, while much of the Doctor's life force is drained from him, turning him into a disinterested crank wandering about in his nightgown.
"Valley of the Lost" by Phillip Hinchcliffe. The Doctor and Romana travel to the jungles of Brazil, where they come upon a Luron scout ship which crashlanded in 1870. The vessel emits a bubble of time which has kept the surroundings preserved as they were then — including a lost city of gold, inhabited by Maygor savages who worship the only Luron survivor, Godrin, as their deity. Godrin convinces the Doctor to bring him to London, but once there uses modern technology to send a signal to the Luron fleet to commence an invasion of Earth. The Doctor and Romana manage to infiltrate the Luron mothership and take control of its power source. Faced with destruction, the Lurons agree to abandon their invasion.
"City of Death, Douglas Adams, was set in 1928 with the Doctor and Romana, aided by Bulldog Drummond-esque detective "Pug" Farquharson, on the trail of the stolen Mona Lisa. The story started with a close-up of the Doctor and Romana which pulled back to reveal them standing high atop the Eiffel Tower(OTL this was abandoned when the special lens rented for the sequence from a Spanish firm could not be made to fit the BBC camera). The artist who sketches Romana in the café was is a much more prominent figure called Bourget, who is in league with Scarlioni(Cut from the finished version).
The Gamble of Time, David Fisher, Continues off from City of Death, pursuing Scarlioni from Paris to Monte Carlo where his partner, the Baroness Heidi, is using time travel technology to cheat at roulette at the casino to fund Scarlioni's time travel experiments. The Doctor and Romana ultimately discover that Scarlioni is trying to journey back to prehistoric Earth and prevent the time bubble explosion in order to save his fellow Sephiroth, who are dying from an illness he believes is caused by radiation from the accident. However, the Doctor discovers that the culprit is actually the common cold virus, to which the Sephiroth have no immunity. Scarlioni agrees to let the time bubble accident happen, in order to spark the genesis of life on Earth. This episode was originally writeen
"The Creature from the Pit" follows David Fisher's original outline which revolves around Adrasta's attempts to claim the TARDIS for herself. K-9 eventually takes Adrasta away in the TARDIS, returning her — cowed and defeated — at the story's conclusion. Upon initially being thrown into the Pit, the Doctor is attacked by Hellyn, a former member of Adrasta's team of engineers. In the final episode, a battle fleet from Tithonus arrives, threatening to destroy Chloris with a photon missile. Erato and the Doctor travel into space in Erato's ship, and the Tithonian weaves a spacesuit for the Doctor, enabling him to reach the missile and disarm it.
The
Dirk Gently series does not exist, as it came about due to a strike preventing "Shada" from being entirely filmed and the plot was used in that series. Here Shada is completed(Unused footage was used in "The Five Doctors" OTL but here is included in the actual episode( A Big Finish Audio story uses the script but the Eighth Doctor instead). The famous scene where the Doctor is chased by the orb while on a bicycle takes place at night.
Season 18
Meglos
State of Decay
Warrior's Gate
Into the Comet
The Psychonauts
Sealed Orders
The Keeper of Traken
Kinda
Logopolis
The Doctor and the Baker
"Meglos" retains Lexa's self-sacrifice as a more dramatic end for the character.
"State of Decay" has an old woman Time Lord hermit who tells the Doctor about the Great Vampire. Subplots involving townsfolk nocturnally wandering the forest like zombies and rebellious citizens being found with bat-like bite marks on their necks. Adric's character is introduced "an Artful Dodger in Space", though in his relationship with the Doctor, which lasted until the Fourth Doctor regenerated.
"Warriors' Gate" opens with an attack on the
Privateer by an "Antonine Killer", which led to the ship becoming trapped at the Gateway. A crewman named Nestor is included. Stephen Gallagher's original script is intact. Romana does not depart.
"Into the Comet" by James Follett. Involved monsters attacking a race of beings who live inside Halley's Comet, unaware that there is anything beyond it.
"The Psychonauts" by David Fisher. The Doctor battles the Nephilim, creatures who travel through time in sleeping units shaped like sarcophagi.
"Sealed Orders" by Christopher Priest. A political thriller set on Gallifrey in which the Doctor is seemingly ordered to kill Romana by the Time Lords. A complex plot involving time paradoxes results in the appearance of a second Doctor (who dies) and lead to Romana's departure; it also involved the idea of time running into itself, resulting in one TARDIS existing inside another. Baker proposed that the series allow the Doctor to have a romantic moment with one of his companions, albeit as a joke. (Baker's idea: that the companion kiss him, the Doctor act shocked, but then decides he likes it and asks to be kissed again.). This idea was accepted and done with Romana II actress Lalla Ward.
"The Keeper of Traken" follows Johnny Byrne's original outline and is set in a mediaeval-type society, divided between the scientific Greys and the zealous Blacks, led by Hellas and Zorca, respectively. Zorca summons a being called Mogen he believes is a demon, but whom the Doctor later realises is the last survivor of a race of super-beings with fantastic mental abilities. Mogen wants to take control of the powerful Source in order to use Traken as the launching pad for galactic conquest. Zorca frames Adric for murder, and the cliffhanger for episode two originally involved the Doctor, Adric and Hellas on the brink of execution, about to be crushed between blocks of steel. A key element of part four was a stolen component from the TARDIS, which Mogen uses to construct a time disintegrator with which he plans to kill the Doctor.
"Kinda" is a Fifth Doctor story OTL, however it was intended to be a Fourth Doctor story and originally depicted the Doctor as a wise old sage. Here it is indeed a Fourth Doctor story.
"Logopolis", as per the plan of John Nathan-Turner, reintroduced a familiar companion to the regular cast to ease the transition from Tom Baker to Peter Davison after the former's seven year tenure in the lead role. Both Elisabeth Sladen and Louise Jameson were asked to to ask if they would like to reprise their parts as Sarah Jane Smith and Leela respectively. Neither were interested in going back to the programme, so Tegan was created instead.
"The Doctor and the Baker",John Brosnan. Brosnan was at the time writing for the magazine
Starburst. He pitched the idea of the Doctor landing at the BBC Television Centre and meeting Tom Baker, the two working together to combat a threat. The episode became very meta as the Master's latest plan threated the entire Multiverse. This episode marked both the depature of Tom Baker, and the Doctor's regeneration.