Sephiroth (Japanese: ?????, Hepburn: Sefirosu) is a character from the Final Fantasy video game series developed by Square (now Square Enix), appearing as the main antagonist of Final Fantasy VII. A former soldier of the megacorporation Shinra and the coworker of Zack Fair and superior of Cloud Strife, he possesses superhuman physiology as a result of an experiment in which Shinra injected him with cells from the extraterrestrial lifeform Jenova when he was still a fetus. Upon discovering this, Sephiroth becomes consumed by rage and decides to take control of the Planet by harnessing its life force and annihilating all life on it in order to become a god amidst the destruction. Sephiroth's background and role in the story are expanded upon 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.