Bad Jim

Three soft-hearted bandits (John Clark Gable, James Brolin, and Richard Roundtree) purchase a horse from Billy the Kid. They use the easily recognizable steed to convince their victims that they are members of Billy's gang, allowing them to rob people without firing a single shot. One of the gang members breaks away from the others, taking the horse with him, and pretty soon he's every bit as mean and dangerous as the real Billy.