Mousersaurus Rex

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Mousersaurus Rex is a giant red dinosaur in the live-action segment of The Super Mario Bros. Super Show! episode "Quest for Pizza / The Painting". This dinosaur has sunglasses like Mouser and resembles him. He helps King Koopa during the episode; however, his foot keeps getting hurt.

It's very, very possible they are a species; however, only one was seen in the cartoon.