The Xenosaga (ゼノサーガ) series is a series of science fiction role-playing video games developed by Monolith Soft and published by Namco Bandai on the PlayStation 2. The series began with the 2002 release of Episode I: Der Wille zur Macht, which was followed in 2004 by Episode II: Jenseits von Gut und Böse and in 2006 by Episode III: Also sprach Zarathustra. The music of Xenosaga includes the soundtracks to all three chapters, as well as the music for its spin-off media.