Mack is a fictional 1980s Mack Superliner truck, bearing license plate "RUSTEZ3", voiced by John Ratzenberger. A dedicated member of the Rust-eze Medicated Bumper Ointment Team, Mack pulls Lightning McQueen's trailer to his races. After Lightning's entire pit team quits, Mack is his only friend. When driving Lightning to a three-way tiebreaker race in Los Angeles, California, he drove all night long because Lightning wanted to reach the race before Chick and The King got there, and wanted to hang out with the Dinoco team. When Mack was driving, he fell asleep. The Delinquent Road Hazards came by and threw Mack around the road, causing a sleeping McQueen to fall out of his tralier. When the Road Hazards leave, Mack wakes up, not realizing that Lightning is gone. Then Lightning gets lost and ends up in Radiator Springs, New Mexico. Eventually, Mack finds Lightning in Radiator Springs, making sure Lightning gets to his race in time, under threat of being fired by Lightning's agent Harv. After the race, along with Lightning, Mack moves to Radiator Springs and is shown at Flo's Cafe in the short Mater and the Ghostlight.