Truckasaurus is a giant mechanical truck/dinosaur. It was created by Leo G. Clark. It is described as "20 tons and four stories of car-crunching, fire-breathing, prehistoric insanity".
The Simpson family went to see it but accidentally drove into the stadium where Truckasaurus grabbed the car in its jaws and almost killed the Simpsons and the owner of the robot pays the damage .
It ended up in The Auto Graveyard, where it fell into the hands of Bart Simpson, who accidentally turned it on, causing it to run amok in Springfield. It walked into Springfield Harbor and was never seen again.
In Truckasaurus: The Movie he is called "John Truckasaurus and is voiced by Marlon Brando.
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Truckasaurus was created by Professor Frink.
 Behind the Laughter
Truckasaurus was inspired by the real life robotic dinosaur, Robosaurus.