Mater is a rock star in a heavy metal band. He starts out in a garage band called "Mater & The Gas Caps" and rises to the top with his hit song, "Dad Gum" (which bears a heavy-metal style by accident when the drummer goes crazy trying to kill a fly on the drum while recording an album), a song based on the line Mater is famous for. Lightning McQueen joins him on stage in the middle of a huge concert and they rock into history.
