Steve is an amalgamation of old food and garbage created from Shnitzel sweeping trash under a kitchen cabinet for several years. He was discovered behind the cabinet in "The Health Inspector" when Mung, Shnitzel, and Chowder attempted to move it, thus disturbing its resting place. Steve began to wreak havoc on the kitchen until Shnitzel and Chowder managed to lure him away with garbage and food scraps.
Steve is attracted to muscle magazines, food scraps, and garbage, the latter two of which he enjoys to eat.
Steve is an incredibly aggressive garbage monster, and will do anything to get what he wants with complete disregard for his surroundings. Steve speaks in the first person and occasionally announces how he's feeling and what he's doing.
Steve takes on the appearance of a large, gooey green monster with various miscellaneous objects floating around inside of him. His most distinct features are his large eyes, bushy eyebrows, and a massive lower jaw with tooth-like spikes along his upper and lower mouth. He also has features which resemble and function as limbs.