Marvin Flumm

Marvin Flumm is a telepathic Marvel villain who used his powerful psi abilities to infiltrate S.H.I.E.L.D.'s Psi Division before revealing his true loyalties to Hydra. Operating as Mentallo, he has since lent his mind-control talents to numerous criminal organizations and shadowy factions.

Marvin Flumm is one of Marvel's quietly enduring Silver Age creations, conjured by the legendary duo of Stan Lee and Steve Ditko in Strange Tales #141 back in 1966 — a debut pedigree that puts him in genuinely rarefied company. Over a remarkable span of nearly six decades, he's accumulated 65 catalog appearances and four key-issue designations, proof that collectors keep circling back to him. His page-sharing résumé is impressively star-studded — Spider-Man, Captain America, Wolverine, and their alter egos all cross his path — and his heaviest presence in titles like The Spectacular Spider-Men, Miles Morales: Spider-Man, and Thunderbolts speaks to a character who keeps finding his way into Marvel's most charged corners. If you love digging into the connective tissue of the Marvel Universe, Marvin Flumm is exactly the kind of figure worth tracking down.