Wolverine Unleashed #21 was published by Marvel UK/Panini UK on January 1, 1998, as part of a series that began in 1996. Ann Nocenti and Chris Claremont write, and art comes from John Byrne, Marc Silvestri and Rick Leonardi. It features Wolverine, Cyclops, Storm, Colossus and Nightcrawler, among 25 characters cataloged on VerseDB.