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|First appearance||Strange Tales #141 (February, 1966)|
|Notable aliases||Think Tank, Master of Psionics|
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Mentallo is a fictional supervillain, a mutant appearing in American comic books published by Marvel Comics. After having been fired for cause after attempting a covert S. H. I. E. L. D. takeover, he has since operated as both a freelance criminal and subversive and a high-ranking agent of HYDRA.