Gary appears in 19 issues.
Girls, acne, homework and supervillains. When you're a teenager it pays to be - Invincible. Mark Grayson is the hero Invincible, whom is a Viltrumite/Human hybrid. Mark is one of the greatest heroes on Earth and is the son of Omni-Man, the new emperor of the Viltrumite empire. Invincible is a true hero to the very end.
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