What If...? » 9 issues
Volume » Published by Marvel. Started in 1998.
Volume 2.
Mastermind appears in 9 issues in this volume.
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Issue #13
What if Professor X had Become the Juggernaut?
May 1990
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Issue #23
What If the All-New All-Different X-Men Had Never Existed?
March 1991
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Issue #24
What if Wolverine was Lord of the Vampires?
April 1991
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Issue #32
What if Phoenix had not Died
December 1, 1991
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Issue #33
What If... Phoenix Rose Again?
January 1, 1992
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Issue #43
What If Wolverine Had Married Mariko?
November 1, 1992
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Issue #59
What If Wolverine Led Alpha Flight
March 1994
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Issue #60
X-Men Wedding Album
April 1994
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Issue #74
What if Mr. Sinister Formed the X-Men
June 1, 1995
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