The T-Rex first appeared in Sorry, Wrong Era as the main antagonist of the episode where he pursued Jimmy, Carl and Sheen when Hugh played with Jimmy's Quantum Replay 9000 and accidentally sent them back to the late Cretaceous Period. He made his final appearance in the The League of Villains. He later appeared in a few episodes and made a cameo in the Jimmy Timmy Power Hour 2: When Nerds Collide!
- Due to his recurring appearances, he became a staple in the franchise.
- Unlike the T-Rex from Cookie Time, this one bears more of a resemblance to the T-Rex from Jurassic Park.