Kombat Rage was a kombat element and an integral part of the story of Mortal Kombat vs. DC Universe.
In The Story
The Kombat Rage is the main part of the Story Mode. It came to both universes after the creation of Dark Kahn. Once influenced by the rage, the warrior consumed by it sees his/her worst enemy (as seen through Liu Kang's perspective in the DC Universe story). Because of the hallucinations, a kombatant could fight his best friend. Throughout the story, the Rage would switch fighters after the current host would be defeated in combat. Up until the last scene, each side attempts to uncover the source, thinking it lies with the other universe after the merging of the two. At the last scenes, both universes kombat each other as a group. Only Raiden and Superman survived, with each about to kill their main enemies, but being stopped by their best ally, both of which would later fight and defeat as a result. Upon the victory, the two venture to Dark Kahn's fortress, and fight each other to see who would kombat Dark Kahn (although the actual contender is from the perspective the player chooses). After destroying Dark Kahn, the two universes end the merging.