X-Factor is an American comic book series published by Marvel Comics. It is a spin-off of the popular X-Men franchise, featuring characters from X-Men stories. The series has been relaunched several times with different team rosters, most recently 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 2005, a new X-Factor series was launched, following the mutant detective agency X-Factor Investigations.
X-Factor launched in 1986 featuring an eponymous team composed of the five original X-Men that debuted in X-Men (vol. 1) #1 (1963):
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Official Site: Marvel Comics
Links: Wikipedia Marvel / X-Factor Marvel Directory