Cruz Ramirez becomes a racer after initially training Lightning McQueen in Pixar's Cars 3.
Cruz starts as a high-performance trainer at the Rust-eze Racing Center. She helps McQueen use modern simulation technology, but she also reveals that she once wanted to compete herself and had been discouraged by other racers.
During the Florida 500, McQueen recognizes Cruz's racing ability and gives her the chance to take his place. She defeats Jackson Storm and begins her own professional career while McQueen adopts a mentor role.
The film presents Cruz's success as a continuation of McQueen's growth rather than a simple replacement. Her yellow design and energetic personality also contrast visually with McQueen's red bodywork.