Mutant X is a comic book published by Marvel Comics between 1998 and 2001, featuring Havok, a mutant and former member of the X-Men, who is transported into a parallel dimension. It was written by Howard Mackie and inked by Andrew Pepoy, with a series of different pencilers.

Havok is a fictional character appearing in American comic books published by Marvel Comics, commonly in association with the X-Men. He first appears in The X-Men #54, and was created by writer Arnold Drake and penciller Don Heck. Havok generates powerful "plasma blasts", an ability he has had difficulty controlling. One of the sons of Corsair, he is the younger brother of the X-Men's Cyclops, and the older brother of Vulcan. He often resents Cyclops's authoritarian attitude and reputation as a model member of the X-Men.