Marvin is Martin's rival, and evidently one who does extreme things (such as "snowboarding down K-2.") He does virtually everything that Martin himself can do (better of course), and even dresses in a style similar to him. Marvin's similarity-yet-dissimilarity to Martin may be a nod to Bizarro's resemblance to yet difference from nemesis Superman. His father is a pilot, allowing Marvin to travel around the world on a frequent basis. Marvin first appeared in "Attack of the Mothman" where he shows off his skateboarding skills and his very own comic book. His talents make Martin jealous as Diana, Java, Jenni and even Billy faun over him. He reappears in "The Amazon Vapor" where he discovers Martin and Diana's secret and helps them on their mission. In "The Third Eye", he works for the Center and has acquired his own U-Watch much to Martin's dismay and Diana's delight. Unfortunately for him, after the mission, he ends up being deported to the Center's South Pole facility and blames his unfortunate circumstances on Martin. He continues to hold a grudge against Martin (and Martin still stands strong at his hatred of Marvin) throughout "Body-Swappers" until Martin gives him the majority of the credit for getting rid of the parasite and M.O.M. decided to relocate him to Hawaii- much to Martin's dismay and much to Marvin's elation. In a subsequent episode, "Rage of the Leprechaun", Marvin contacts Martin and Diana for help after he was being stalked by a leprechaun that wanted to get back the magical four leaf clover that made anyone who held it incredible lucky that Marvin had taken from him. Which makes Marvin unlucky because he took it rather than received it, which makes a person lucky. After the incident, Marvin is chewed out by M.O.M. for keeping the clover instead of getting rid of it. What happens to him after that is unknown, even by the end of the series. Voiced by Matt Hill.