In Pixar's Cars 3 (2017), Cruz Ramirez uses racing number 51.
Cruz begins the film as Lightning McQueen's high-performance trainer at the Rust-eze Racing Center. Although she initially expects to work behind the scenes, her driving ability becomes central to the story when she gets the opportunity to race.
The number 51 connects Cruz to Doc Hudson, whose Fabulous Hudson Hornet also raced as number 51. That visual link reflects the film's themes of mentorship, legacy, and passing racing knowledge from one generation to another.
Lightning McQueen retains number 95, and The King is associated with number 43, so those numbers are common sources of confusion. Cruz's number becomes especially important during the film's climactic Florida International Speedway race, where she takes on a larger role in the Piston Cup story.