Xenosaga Episode I: Der Wille zur Macht is a science fiction role-playing game (RPG) developed by Monolith Soft and published by Namco for the PlayStation 2. Released in 2002 in Japan and 2003 in North America, it is the first installment in the ambitious Xenosaga trilogy, a spiritual successor to Xenogears on the PlayStation.

The subtitle, “Der Wille zur Macht,” is German for “The Will to Power,” referencing the philosophical ideas of Friedrich Nietzsche. The game is renowned for its deep narrative, thematic complexity, and cinematic presentation, combining traditional turn-based RPG gameplay with a rich science fiction universe.