We may earn a commission from links on this page.Apple TV's sci-fi series For All Mankind starts with a tantalizing alt-history premise: What if Soviet space pioneer Sergei Korolev hadn’t died prematurely in 1966, but instead helped bring his country’s space program into full bloom, extending the space race indefinitely? If America and the world had been forced to continue the space program, our past (and present) would look quite different—at least according to this show, which jumps across decades to imagine how that might have unfolded in an alternate past. (By the current fifth season, set in alt-2012, some...