X-Factor launched in 1986, featuring an eponymous team composed of the five original X-Men. In 1991, the founding members were incorporated back into the regular X-Men series, and X-Factor relaunched as a U.S. government-sponsored team incorporating many secondary characters from the X-Men mythos. The series was canceled in 1998.
In 2002, a four-part X-Factor mini-series detailed an investigation by the Mutant Civil Rights Task Force into an alleged conspiracy by hate-groups to commit murder against mutants. The series was written by Jeff Jensen with artwork by Arthur Ranson.
In 2005, a new X-Factor series was launched, following the mutant detective agency X-Factor Investigations.
In 2014, a new X-Factor series will be launched featuring Polaris, Gambit and Quicksilver as members.
|X-Factor||Heroes who are new members of X-Factor|
- Though many pre-existing X-Factor members are in the game, only members of Havok's team and onward seem to be counted for the bonus, ignoring Cyclops' original X-Factor team and only counting Havok's X-Factor and Multiple Man's X-Factor as members.