The world of T-Rex is inhabited by clothed civilized dinosaurs. In Rep City a gang of thugs, led by Big Boss Graves, is planning to take over the city, but professor Edison asks the help of 5 stand-up comedians, the 5 T-Rex brothers, Bugsy (purple), Bernie (blue), Buck (yellow), Bubba (green) and Bruno (pink). By entering a machine hidden behind the professor's bookshelf, they are equiped with a powerful armor that also hides their real identities.
The show is kind of comparable with the TMNT but has less action and more jokes. They are comedians after all, the brothers constantly made sarcastic remarks to one another.