Oh, Doctor! was the fifth of Roscoe "Fatty" Arbuckle's two-reelers for his own Comique Film Corporation (the unlettered Arbuckle always referred to the name of his studio as "Comeeky"). Fatty plays a doctor who falls in love with beautiful horse fancier Alice Lake. For her sake he bets on a 500-to-one shot, which amazingly comes across the finish line first. When Fatty learns of his good fortune, he is dressed in a policeman's uniform for reasons that are too complicated to go into here. Celebrating his windfall, the hero rushes into a poolroom, where the patrons take one look at his uniform and head for the hills. Once the "phony cop" gag has been milked for all it's worth, the story goes off on a different tangent when Fatty is led to believe that he's lost his fortune. Arbuckle's close pal Buster Keaton was here cast as Fatty's son (!), while the star's nephew, Al St. John, enacted the principal "heavy" role.