When Gerald Bernardson's daughter died due to a genetic deformity, he began studying her disease and learned that she had inherited it from him. Distraught, he began experimenting on himself, turning himself into Mutagen. He then began going on rampages through hospitals killing patients with genetic diseases in order that they don't pass it on to any of their children.[1]


  • Mutagen's body adapts virtually instantly to any threat. His chin grew spines when Spider-Man punched him, and his body developed insulation when he was electrocuted.

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