Duel Personalities

Duel Personalities is a 1939 Our Gang short comedy film directed by George Sidney. It was the 177th Our Gang short 178th episode, 89th talking short, 90th talking episode, and 9th MGM produced episode that was released.

Coincidentally, the professors assistant is played by actor Phillip Terry, who would marry Joan Crawford a couple years later. He worked with at MGM with Joan Crawford, which is where they met. This film was ranked as slightly above average, though the series would continue to go downhill in the coming months.

Source: Wikipedia