"X-Tinction Agenda" is a 1990 crossover comic book storyline published by Marvel Comics that ran through Uncanny X-Men and its spin-off titles, X-Factor and New Mutants. "X-Tinction Agenda" not only reunited the X-Men after a prolonged period in which the team had been scattered around the globe, but featured the combined might of the three mutant teams for the first time, in their fight against the mutant-exploiting Genoshan government.

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.