Slide, Kelly, Slide is about Jim Kelly, a self-styled baseball whiz who talks himself into a job with the New York Yankees. Though his boundless braggadocio is backed up by his talent on the baseball field, Kelly soon alienates himself from the rest of his teammates. Veteran Yankee catcher Tom Munson – also the father of Kelly’s sweetheart Mary – tries to set the young upstart straight, but Kelly isn’t interested.