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Monster Truck Wrestler
I-Screamer is a monster truck wrestler.
I-Screamer is an ice cream monster truck who was Mater's first opponent. He was defeated when Mater posed as a child and asked for a double dipped, dipstick sundae (ice cream), then when I-Screamer's back was turned, Mater used his tow hook to flip him over and beat him. To add insult to injury, Mater sprayed the entire contents of a fire extinguisher onto him as ice cream, and topped it off with the empty extinguisher as a cherry on top. He did not appear in any other episodes.