Factor-X #21 was published by Planeta DeAgostini on September 1, 1989, as part of a series that began in 1988. It features Spider-Man, Cyclops, Beast, Jean Grey and Iceman, among 25 characters cataloged on VerseDB.
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Alexander Power
Warren Kenneth Worthington III
En Sabah Nur
Arthur Maddicks
Henry Philip McCoy
Tabitha Smith
Cameron Hodge
Tyrone Johnson
Scott Summers
Tandy Bowen
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