The X Factor is an underground nightclub for mutants of all ages in a ghetto area of the Bronx. It lies in the basement of an abandoned church. The identity of the owner/founder of the club is a mystery. Only mutants are allowed to enter, no exceptions. Everyone must show their power at the door or have their mind scanned by a telepath. Any human who tries to enter the club will be beaten, have their short-term memory erased, and wake up in a dumpster in Harlem the next morning.