Sephiroth is later revealed to be the result of an experiment by the megacorporation Shinra, in which they injected him with cells from the extraterrestrial lifeform Jenova when he was still a fetus. Upon discovering this, Sephiroth decides to follow what he believes to be his destiny and take control of the Planet, while Cloud and the game's other protagonists attempt to stop him. Sephiroth's background and role in the story are expanded in the "Compilation of Final Fantasy VII". Additionally, he appears as a guest character in other video games and media, such as a recurring boss in the "Kingdom Hearts" series and as a playable character in "Super Smash Bros. Ultimate".