X-Factor is an American comic book series published by Marvel Comics. It is a spin-off from the popular X-Men franchise, featuring characters from X-Men stories. The series has been relaunched several times with different team rosters, most recently in X-Factor v. 3 as X-Factor Investigations.
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. Written by Peter David, the series drew acclaim from Ain't It Cool News, as well as controversy for establishing a homosexual romantic relationship between Rictor and Shatterstar, a move criticized by Shatterstar's co-creator, Rob Liefeld. The series also won a 2011 GLAAD Media Award for Outstanding Comic Book. The series ended in 2013.
In 2014 a new series written by David, All-New X-Factor was launched featuring a new corporate-sponsored X-Factor team.