Heavy Metal Mater is the seventh episode of the spin-off of Casey jr and Friends.
At Flo's V8 Cafe, the cars are enjoying karaoke night (Guido is currently singing) and Lightning McQueen tells Mater to sing. Mater replies "Nah, I don't want to steal the show", and then he starts his story. Maters tells Lightning that he used to be a rock star. He started out in a garage band called Mater and the Gas-Caps with Mater as the lead singer, Rocky & Eddie at the electric guitar, and a drummer Pitty. They first performed at the Top Down Truck Stop (a location that first appeared in a deleted scene from Cars and also made a cameo in the film), and when they finished, Mia and Tia asked them if they had a record. Realizing they did not have a record made yet, the band heads over to a recording studio to make one. Everything went well in the studio until a fly got in. When the drummer tried to swat the fly with his drumsticks, he started playing faster. Mater had no choice, but to sing faster too, he liked the new heavier sound. A music agent named Dex liked their new sound too. Dex said all they needed was a new name. Mater thought for a while, but before he could answer a package arrived. "Where do you want this heavy metal, Mater?" asked the mover. "That's it!" cried Mater. And Heavy Metal Mater was born. The band's concerts sold out wherever they went. The band all had a cool new look that drove the fans wild. Heavy Metal Mater always put on an amazing show. They had lights, guitar solos, and they closed every show with their most popular song, "Dad Gum". And just as they finished the song, a giant Heavy Metal Mater balloon would float over the audience. "You were Heavy Metal Mater?" asked Lightning. "No," replied Mater. "We was Heavy Metal Mater!". Lightning was in the band too, jamming on the keyboard. He even joined Mater at the microphone for the big finale. "I'm sorry Mater, that did not happen," said Lightning. "Well suit yourself," replied Mater as he looked up in the sky where there was the giant Heavy Metal Mater balloon.
- Lightning McQueen
- Drummer Pitty
- Dex (character inspired by Tex)
- Rodney the Rocker
- Vroomaroundus Bugus
- Susie the Little Blue Coupe
- Bertil the Magic School Bus (Cameo)