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Marvin is a member of the Vehicle Voltron Land Team, he can often be found hanging around with his friend Hutch, either playing cards or brawling with each other. Marvin is usually comedic, he pilots the All-Terrain Space Vehicle that forms the right foot of Voltron.
Voltron: Defender of the Universe cartoon continuity
Vehicle Force sub-series
Devil's Due Publishing comics continuity
Marvin was one of several people chosen to pilot the machine named "V-15" by Galaxy Garrison, he and his team were first deployed after the original Voltron to recapture it until he received new orders to support Voltron.