Energetic priest Don Camillo returns to the town of Brescello for more political and personal duels with Communist mayor Peppone.
When a secret marriage is planned between Othello, a Moorish general, and Desdemona, the daughter of Senator Brabantio, her old suitor Roderigo takes it hard. He allies himself with Iago, who has his own grudge against Othello, and the two conspire to bring Othello down. When their first plan, to have him accused of witchcraft, fails, they plant evidence intended to make him believe Desdemona is unfaithful.
Bewildered, Don Camillo learns that Peppone intends to stand for parliament. Determined to thwart his ambitions, the good priest, ignoring the recommendations of the Lord, decides to campaign against him.
