Fan Casting Cars 4: Piston Cup Finale (2026)

Nine months after the end of the previous film, Rust-Eze Medicated Bumper Ointment has been purchased by Dinoco owner Tex Dinoco. Lightning McQueen has gone into a part-time racing business, where he races for half of the season and coaches Cruz Ramirez, who has become a rookie racer for Dinoco, the other half. While training with Cruz one day at Willie's Butte, Lightning McQueen sees an ad on the television that announces the Piston Cup having to go into bankruptcy due to insufficient funds from the crowd. To make matters even more heart-wrenching, a returing champion racer named Peyton Wheeler threatens to replace the Piston Cup with his father's more financially successful racing business the Wheeler's Cup. Lightning McQueen then decides to strike a deal with Wheeler where they will race together in a street race in Los Angeles, and that if McQueen wins, the Piston Cup can get a large sum of money to stay open, but if Wheeler wins, the Piston Cup gets replaced with the Wheeler's Cup permanently.