Dr. Frankenwagon's Monster is a character from Monster Truck Mater.
When the final round started, Mater thought that his opponent was just Dr. Frankenwagon, who was a small car, so he thought it would be easy. However, his real opponent was Dr. Frankenwagon's monster, making Mater scared.
Then, Lightning joined the story. Mater left Lightning to fight the monster while he talks with Mia and Tia. After a while, Mater grabs the monster's wrecking ball with his tow hook and drives underneath the ring. At the other side, he pulls his tow hook, which flips the ring upside down onto the monster and killing
- He is a reference to Victor Frankenstein's monster.
- He is a combination of parts from construction vehicles, similar to the Screamin' Banshee.