Parent-teacher night leads Mr. Drummond to a romance with Arnold's teacher and poor Arnold to the jealousy of his classmates. Arnold tries every trick in the book to win back his classmates, including one which may have him expelled.

After Arnold fails to measure up to the demands of the basketball, baseball and volleyball teams, Drummond convinces the boy to try football on for size and then pays the coach a clandestine visit to ensure Arnold a place on the team.

Does Drummond have a third son, there's a young man at the door who claims he does and that he is.