In Pixar's Cars 3, Cruz Ramirez works as a trainer at the Rust-eze Racing Center.
Cruz is a high-performance trainer assigned to help Lightning McQueen prepare for competition against a new generation of technologically advanced racers. She is enthusiastic, knowledgeable, and initially more comfortable coaching than competing herself.
The story changes when McQueen's training and racing plans bring Cruz into the action. Her abilities and confidence develop as she learns that her own ambitions matter, not just the goals of the racer she is helping.
Cruz is voiced by Cristela Alonzo. She is not the owner of Rust-eze, the company associated with McQueen's sponsorship, and she is not the film's race announcer. Her role as a trainer is important because it sets up the mentor-and-student relationship at the center of Cars 3.