Tyrannosaurus Rex

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Ook, Gluk, Tippy Tinkletrousers, Cavemen
George, Harold, Mr. Krupp/Captain Underpants, Sulu, Crackers, Chief Goppernopper, JP Goppernopper
Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers, The Adventure of Ook and Gluk: Kung-Fu Cavemen from Future

The Tyrannosaurus Rex, or T-Rex was a species of carnivorous dinosaur. It lived at the end of the reign of the dinosaurs and it's name means "tyrant lizard king". Like the rest of the dinosaurs, the T-Rex was killed off once and for all when a meteor hit planet Earth 65 million years ago. In Ook and Gluk: Kung Fu Cavemen from The Future Mog Mog and her daughter Lily are T-Rexes that have befriended Ook and Gluk. In the 10th Captain Underpants book, Tippy Tinkletrousers rides one to capture the five heroes and after a meteor hits the earth and one of Tippy's clones is killed, the T-Rex is killed along with the rest of the dinosaurs. 

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