Millionaire's son Duke wants to be a champion boxer but takes time out to enroll in college when he sees co-ed Susie. The students wonder about his having a chauffeur and house full of servants. Susie likes him but, to get rid of her, his manager tells her Duke already has a New York chorus girl. As the students listen to a radio broadcast of his victorious fight from San Francisco, she learns that the student Duke is the boxer Duke and that there is no chorus girl.

Based on the David Belasco stage production of the Max Marcin play in which heavyweight-champion Jack Dempsey played the role of the fighter, Tiger: This "behind-the-scenes look of a heavyweight-championship fight" looks much like all of the other boxing films in which the Champ gets involved in a frame-up and is asked to take a dive.

For the ventriloquist Gabbo his wooden dummy Otto is the only means of expression. When he starts relying more and more on Otto, he starts going mad.