Evolution is making us taller, skinnier, with bigger eyes. Kinda alien looking. Maybe we’ll invent time travel and come back in neat little UFOs.
That is literally the plot of the book series, mind warp. Basically super soldiers go back in time and live regular lives until they have a kid and disappear to protect them. The kid inherits their power. Then more super soldier bounty hunters go back to kidnap them. Their time machines are flying saucers and it’s thought they were aliens until the big twist that they were just time travelers.