Interestingly, Margo surviving and finding refuge in the Soviet Union is actually the only big piece of information that the Season 3 finale revealed about Season 4 in 2003, unless confirmation that Radiohead evidently still releases “Everything in Its Right Place” in the For All Mankind version of history counts.
Well, the Soviet Union circa 2003 in the For All Mankind universe certainly isn’t Jupiter, and does not qualify as a happy ending for Margo!
Spoilers ahead for the Season 3 finale of For All Mankind.
The third season of For All Mankind came to an end with a cinematic finale that delivered some triumphs (including for the North Korean space farer), some tragedies, and one big reveal in the final moments about Margo.