X-Factor #66 was published by Marvel Comics on May 1, 1991, as part of a series that began in 1986. Chris Claremont and Fabian Nicieza write, and art comes from Art Thibert, Glynis Oliver and Steve Buccellato. This 36-page issue features Captain America, Cyclops, Beast, Thing and Jean Grey, among 23 characters cataloged on VerseDB.