List items
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First appearance: Defenders #4 (February 1973)
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Listed as Vance Astro; First appearance: Marvel Super Heroes #18 (January 1969)
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First appearance: Iron Man #109 (April 1978)
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First appearance: The X-Men #2 (November 1963)
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First appearance: Captain America #272 (August 1982)
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Listed as Viper; First appearance: (as Madame Hydra) Captain America #110 (February 1969); (as Viper) Captain America #180 (December 1974)
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First appearance: Avengers #57 (October 1968)
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First appearance: Amazing Spider-Man #2 (May 1963)
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First appearance: Fantastic Four #52 (July 1966)
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First appearance: Tales to Astonish #44 (June 1963)
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First appearance: (Uatu) Fantastic Four #13 (April 1963); (other Watchers) Tales of Suspense #53 (May 1964)
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Listed as Werewolf; First appearance: Marvel Spotlight #2 (February 1972)
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First appearance: (as Human Top) Tales to Astonish #50 (December 1963); (as Whirlwind) Avengers #46 (November 1967)
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Listed as White Queen; First appearance: Uncanny X-Men #129 (January 1980)
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First appearance: Amazing Spider-Man #167 (April 1977)
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First appearance: Strange Tales #102 (November 1962)
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First appearance: Marvel Graphic Novel #4 (1982)
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First appearance: Incredible Hulk #180 (October 1974)
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First appearance: Avengers #9 (October 1964)
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First appearance: Thor #148 (January 1968)
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First appearance: Defenders #17 (November 1974)
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First appearance: The X-Men #1 (September 1963)
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Listed with X-Men; First appearance: Marvel Graphic Novel #4 (1982)
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Listed as X-Men Mansion; First appearance: The X-Men #1 (September 1963)
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Listed as X-Men Jet; First appearance: Giant Size X-Men #1 (May 1975)
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First appearance: Journey into Mystery #97 (October 1963)
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First appearance: Marvel Super Heroes #18 (January 1969)
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First appearance: Journey into Mystery Annual #1 (September 1965)
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First appearance: Avengers #72 (January 1970)
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First appearance: Incredible Hulk #166 (August 1973)
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Xantha, Xartans, Xeronians, Yirbek, Yrds, Z'nox