Some thoughts...
SeaQuest DSV Season 2
Despite a desire to revamp the show, the series doesn't relocate to Orlando. Therefore, despite Royce D. Applegate and John D'Aquino being released from their contracts, both Stacey Haiduk and Stephanie Beacham stay with the show.
Returning Regular Cast:
Roy Scheider, Don Franklin, Stacey Haiduk, Stephanie Beacham, Ted Raimi, Marco Sanchez
Promoted Regular Cast:
Dustin Nguyen as William Shan. With the departure of Chief Crocker, and the drive for youth and diversity, the role of Shan was made a regular, with the character promoted to Security Chief rather than Helmsman and Security Officer.
New Regular Cast:
Eric Close as Lieutenant Anthony Piccolo. A combination of OTL Brody and OTL Piccolo, without the grated fish gills. In this version, he starts as a warden at the UEO prison in the season opener, then remains onboard as am EVA Specialist.
Elise Neal as JK Fredericks. Basically a much much less annoying version of OTL Ensign Henderson, with the PTSD of OTL Lieutenant Fredericks, without the cyber implant.
Episode 1 and 2 - Daggers
A riot at a UEO prison where Daggers are held - whilst OTL Daggers were genetically engineered, here they are more Jason Bourne type soldiers who couldn't be reverse brainwashed and returned to society. Doctor Levine (Timothy Omundsen) returns, now officially described as Westphalen's Deputy and gives the infodump on the brainwashing programmes, much as he did with the paranormal in "Knight of Shadows" the previous season.
Episode 3 - Sympathy for the Deep
A small group of volunteers on a research station are the subject of experiments to trigger ESP talents, but the experiments may be driving the volunteers insane. The episode picks up on the hints that Bridger, Lucas and Tim had some sort of ESP abilities from the last season in "Treasures of the Mind"
Episode 4 - When We Dead Awaken
SeaQuest stumbles upon a warehouse of cryogenically frozen individuals that is under threat from earthquakes. One of the individuals turns out to be Piccolo's missing mother. Builds upon the cryogenic tech seen in "Games"
Episode 5 - Dead End
A SeaLaunch with Ford, Hitchcock, Lukas and Tim on is sucked into a cavern beneath the sea floor and repairs to it mean that they will need to leave one person behind, with each person arguing why they should be on the launch.
Episode 6 - Meltdown (Halloween Special)
An accident at a power station under the ice caps causes the ice to melt and a giant prehistoric crocodile to be released. JAWS with submarines - including manipulating Bridger into the position of declaring that they will need a bigger boat.