Humans are gone, and the film asks what evolution does next. An international team of scientists builds speculative future ecosystems set five million, one hundred million, and two hundred million years from now, working through three climate phases they call Ice World, Hothouse World, and New World. Camera crews shoot real locations, from icy tundra to arid basins, as the backdrop for creatures rendered with computer animation and reasoned out from evolutionary principles rather than invented for spectacle. A giant tortoise called the Toraton grows larger than any dinosaur that ever lived. Squid climb trees as the Squibbons, fish take on bird-like traits, and a bloated fungal predator called the Slithersucker hunts by smell alone. Each creature comes with a biologist's case for why it could plausibly exist given the climate and available niches of its era. The tone stays closer to a nature documentary about real animals than science fiction, treating extinction and adaptation as the only constants left once people are out of the picture.