<Li> Nathan Fillion as Sterling, a rich business car who runs the elite training facility Rust - eze Racing Center, who challenges McQueen's position as a racer . </Li> <Li> Larry the Cable Guy as Mater, a jolly tow truck and Lightning McQueen's best friend . </Li> <Li> Armie Hammer as Jackson Storm, McQueen's new racing rival . The face of the newer generation of high - tech racers, he threatens to displace McQueen as the top racer, and McQueen's career; racer for IGNTR; #20 . </Li> <Li> Tom and Ray Magliozzi as Rusty and Dusty Rust - eze, respectively, the owners of Rust - eze . Following Tom's death in 2014, unused archive recordings from the first film were used for Rusty's lines . </Li>

Who does the voice of jackson storm in cars 3