Marvin wears a modified S.H.I.E.L.D. battle-suit. He has used various weaponry, including conventional firearms, rocket-guns, and a "sonic whammer" which projects intense vibratory blasts. He usually wears headgear that augments his normally weak abilities into something more much more powerful. The device Fixer created for him called the Psycho Helmet also protects him against telepathic feedback, background noise, and psionic assault from other telepaths. Fixer has supplied him with "electronic masks" (or "servo-pods") which adhere to victims' faces and place them under Mentallo's control. Fixer's "mentascope" enables Mentallo to use his psionic power to locate and attack victims from afar. Mentallo is capable of flight via Fixer's "anti-grav propellant unit" or "flying discs" and has also used a tank that can bore through the ground. He has also utilized technology to further bolster himself numerous times, usually through the help of other geniuses, for various ends. Such as accessing billions of minds across the world or controlling the simple consciousnesses of titanic creatures.