Ultimate X-Men » 10 issues
Volume » Published by Marvel. Started in 1998.
Volume 1.
Mastermind appears in 10 issues in this volume.
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Issue #3
Warzone
April 1, 2001
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Issue #4
Betrayal
May 1, 2001
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Issue #5
Killing Fields
June 1, 2001
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Issue #11
Sins of the Past
December 1, 2001
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Issue #12
End Game
January 1, 2002
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Issue #15
It Doesn't Have to be This Way
April 1, 2002
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Issue #27
Return of the King: Part 1
March 1, 2003
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Issue #69
Phoenix?: Part 1
June 1, 2006
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Issue #70
Phoenix?: Part 2
July 1, 2006
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Issue #81
Cliffhangers
June 1, 2007
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