In the trench wars, a soldier who escaped with little harm historically suffer from gasing and in a fever-induced dream, sees unstable planets orbiting bigger planets.
After the war, he becomes a scientist, who comes to have contact with Japanese scientists after the mid 20s.
He becomes a celebrity but 1930 and over, he still faces poverty, he joins the NSDAP and shatter some red jaws with a rusty pipe in Berlin street fights in 1931.
In 1932, idea of an atomic reaction bomb is theorised, the German republic gives him a job in a cover weapon program for the heer, to bypass the Versaille treaty.
In 1933, when Hitler comes to power, he meets Hitler and suggest starting a cover program with the Japanese to compensate loosing the cooperation with the Soviets and that even if Japanese lacks inventivity, he demonstrates that their contribution will cut down the work for Germans. He also reveals that therepublic most likely leaked the idea of an atomic reaction bomb to the Soviet-Union, Hitler grows concerned the international jew conspiracy works to find such a superweapon.
A few years later, testing of different elements reveals Uranium properties. By 1936, the Soviet-Union have noticed censorship of German atomic physics papers, while Hitler orders a full-scale project after the rise of the left in France and Spain.
The Soviet-Union have limited industrial and scientifical powers and thus calls out for a join project with France, which is later joined by the UK after the Czechoslovake crisis.
In summer 1939, the Soviet-Union signs the pact of non-agression with the 3rd Reich still. Hovewer, the test of the first reaction bomb in November 1939 convinces the Anglo-French to make a new deal with Stalin, to betray the non-agression pact should Hitler strike west.
Hitler decides to waite with atomic attacks, the allies have massive amounts of chemical weapons and only 2-3 more are made by the time Case Yellow is initialised. Japan seizes Dutch Indonesia as more oil is needed, the focus on a more advanced military had limited military adventurism in China, thus no Sino-Japanese conflict.
The Red Army strikes into Poland and eastern prussia by surprise, then retreates from Poland and East Prussia destroying railways and blowing up bridges, to attack Romania and the Ploesti oilfields.
France is beaten but the governement retreates to Alger and the remants hold mountainous regions in southern France. It takes a while for the 3rd Reich armies to take back Romania and the Ploesti oilfields.
Germans takes time securing Romania, then go backto France to finnish the job, then put the oilfields back online and raises the luftwaffe.
A dozen more atomic bombs are produced by spring 1941, the UK threaten escalation to chemical warfare in case of attacks, which would need the luftwaffe over Germany itself to deal with.
The Germans pushes into the Soviet-Union, securing Kiev and Minsk in summer, then moves toward the caucase.
The southern caucase is well-defended, in spring 1942 Hitler orders the axis armies to retreat west.
Moscow is bombed heavily with atomic bombs but the Soviet-Union doesn´t collapse, the governement have evacuated to the Urals with much of the important industries of Leningrad and Moscow. Chemical weapons are used in the eastern front, the UK start bombarding Germany and Italy with chemical bombs.
Hitler is angered and in summer 1942 orders retaliation against english cities, starting with London using nerve gas (no atomic bomb against fellow aryans, yet). The USA declares war on the 3rd Reich, Kingdom of Italy and the rest of the european axis. Churchill makes a secret agreement with Hitler, strategic bombings are stopped for the time being. Hitler begina renewed offensive into the Soviet-Union, more atomic bombs are dropped against Moscow, a few other cities are hit. Caucase defence lines before Moscow are broken with chemical weapons and neurotoxic gases, the Soviet-Union uses better poison gas to attack the new axis allies like Estonia, Latvia, Lithuania, western ukrainen and some puppet tartare state in the Crimea.
In 1943, Hitler fortifies axis position in the caucase and Volga, oil production goes up but not at optimal level. Oilfields needs to be defended by the luftwaffe against the Red airforce attacks and RAF attacks from southern Iran.
The United States leads Operation Overload, massive chemical and conventional bombing of German cities, while their forces invades Spain(Italy is too fortified), on November 20th 1943 they soon discover that Walter Weaver´s bombers can reach New York.
The Red Army begins a general advance and a million US volunteers agree to fight in the east front, where they find out they should have double-lined boots and that their rifles clogges and often even breake in half during winter time.
The Red Army reaches Soviet borders by summer 1944, the allies provokes Hitler into using atomic bombs against England´s cities so they can open their way into France with atomic bombs without Hitler closing the road for them with atomic bombs right after. Stalin test his own atomic bomb but does not use it on the front, instead the Red Army uses more lethal chemical weapons en mass.
Between February and April 1945, Berlin is hit with atomic bombs several times, then comes the Red Army.
The SS blow up most facilities before the allies can seize them, German strategic bombers (no longer usefull in battle due to allied fighter mass production) fly Walter Weaver and said scientist into exile to Japan, Roosevelt demands Stalin´s support against Japan but seeing the US applying its destruction plans of what remnaines of German industry, Stalin make a deal with the Japanese and Chinese. Hand over some territories and in the case of Japan, all informations on atomic bomb construction.
In 1946, Mao and the Chinese communistes had their own state in central China, re-equppied by the Red Army they begin fighting Chiang while Japan and the US are threatening each other. The US decides to allow the Japanese to seize their part of China so the whole of it doesn´t go red.
Elections in western europe occures in 1950, communists win in France and south Italy, the US support military coups to overthrow the new governements and send the US army to help crush dissent. The United Kingdom is dissolved in 1951 by corrupt pro-US politicians, abolish the monarchy in a cup in 1953 (despite 3/4 voting for it), post-war england is a corrupt military dictatorship facing guerilla warfare, 15 millions discontent Britons joins the Queen in Australia over the next decades. Frances becomes a military dictatorship ranked as the world´s 3rd greatest military power, preserves its colonial empire with US military help.
In 1981, Greater Indonesia invades Australia, New Zealand and South Africa sides with Australia. Stalemath occures, the dictator of indonesia launch bombers with tactical nuclear bombs against Sydney and Melbourne, most are shot down and the Austral Alliance retaliates. The United States condemnes the Austral Alliance as this dicator and Indonesia was on their side but doesn´t dare to get involved directly.
TTL, the great power relies on fighting an eventual WW3 with tactical nuclear bombs of all sorts, as well as using biological and chemical weapons en mass instead of maintaining large conventional armies and ammunitions. Nuclear proliferation spreads like wildfire. Atomic car-mounted bazookas massively fielded in the mid 80s, evidently with so many tactical weapons, some invariably gets lost to re-appeare in the hands of organised crime, political guerilla groups and tin-pot dicators. The risks of an all-out war are much lower than historically, as a nuclear and chemical war had already been fought. I mean, if you where the prime Minister of the Soviet-Union or President of the US, would you fight a global war where the other big axis member is still active and Monarchist Australia leades the "rogue states"??