Soviet Alien Ape
We all know the Soviets sent a dog in space. Much less known to the public is their simian program. They actually sent out a chimp into deep space exploration back in the mid 70’s. This ape never returned. A few hundred years later, a Soviet Alien Ape did come back to a post-apocalyptic Earth. She found that the humans are gone now. They must have wiped each other out. Nature recovered beatifully.