REX-1 is a character who appears in two episodes of the Teenage Mutant Ninja Turtles (1987 animated series). He is a robot policeman and his name is an acronym for "Robot Enforcement Experiment," the "1" designating his status as the first model produced. His first appearance is in the second season episode, "New York's Shiniest". His only other appearance is in "Leonardo, the Renaissance Turtle".