X-Factor #21 was published by Planeta DeAgostini on December 1, 1997, as part of a series that began in 1996. It features Professor X, Sabretooth, Mystique, Polaris and Forge, among 10 characters cataloged on VerseDB.
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James Arthur Madrox
Raven Darkholme
Lorna Sally Dane
Charles Francis Xavier
Victor Creed
Shard Bishop
Trevor Chase
Valerie Cooper
Kyle Gibney
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