Earth's Mightiest
Professor X is a Jerk! Archive
Earth's Mightiest
THE X-MEN #31 (1967): 1st Cobalt Man
Earth's Mightiest
UNCANNY X-MEN #179: 1st Leech
Earth's Mightiest
ADVENTURE INTO FEAR WITH MORBIUS, THE LIVING VAMPIRE #20-23 (1974)
Earth's Mightiest
THE DEFENDERS #15-16 (1974): vs Brotherhood of Evil Mutants!
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THE UNCANNY X-MEN #98
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THE UNCANNY X-MEN #160-164: First Appearance of Binary!
Earth's Mightiest
AVENGERS #110-111 (1973)
Earth's Mightiest
MARVEL TEAM-UP #2-4 (1972): Human Torch and The X-Men
Earth's Mightiest
X-MEN #65 (1970)
Earth's Mightiest