- Dr. Benjamin Boris Zachary Karbunkle (voiced by Susan Silo) - A thin, sly scientist, of species unknown. Karbunkle used to work for Limburger's superior, Dominic T. Stilton, until Limburger bribed him to cross over. Karbunkle's main task is to think of machines and robots to either battle the Biker Mice, gather resources from Earth, or look up the villain of the week with his dimensional transporter. What is common knowledge is that during the War of Liberation on Mars he gave Modo his bionic arm (though in the pilot he appeared to be unfamiliar with it, calling it an interesting invention), Stoker his bionic tail and Throttle his malfunctioning bionic eyes. Karbunkle was also the one who built the Mind Bender Beam, successfully used on Stoker to brainwash the Freedom Fighter leader into obeying the Plutarkians. Karbunkle is a sycophant, often seen admiring Limburger and praising him; however, Karbunkle's top priority is Karbunkle. He is often seen torturing Fred the Mutant, cares little about his co-worker Grease Pit and has traded Plutarkian employers many times. Karbunkle is very sadistic and is known to enjoy torturing people, wears a white lab coat, high heeled boots, has a green pair of goggles which he never takes off and once in a while, his red underwear is revealed. Also reappears in the 2006 series as well, and suffers the same fate as Limburger.