X-Men: The Ravages Of Apocalypse, developed by Zero Gravity Entertainment and published by WizardWorks Software, is a commercial total conversion for Quake released in November 1997. It replaces the original Quake levels and weapons with new designs, and all of the enemies in the game have been replaced with cyborgclones of popular X-Men characters, all with their own special powers; for example, Archangel is immune to rockets, Wolverine has his healing factor, etc. X-Men: The Ravages of Apocalypse was one of the first total conversions to feature a high profile property.
Being a total conversion rather than a completely new game, it required the full version of Quake to be played.
X-Men: The Ravages of Apocalypse was released as freeware in July 2006. The game's source code was also released, but under an ambiguous license. Modifications have been made to the game to allow it to run as a standalone title. The freeware release includes a patch which adds new gameplay features and fixes glitches from the original version.