A woman takes the law into her own hands after police ignore her pleas to arrest the man responsible for her husband’s death, and finds herself not only under arrest for murder but falling in love with an officer.

Bud Spencer plays Banana Joe, a brawny yet friendly man who lives in a small rainforest village called Amantido with a huge number of his own children and regularly delivers bananas to a South American river port (hence his name). One day, the henchmen of a local gangster boss named Torsillo come ashore in Amantido to initiate the construction a banana processing plant. Of course, Joe (in typical direct-approach manner) evicts the goons, who promptly return to their boss. Torsillo finds out that Joe is trading bananas without a license and decides to exploit it. Upon his next delivery, Joe is apprehended by the police and given the choice of either acquiring a legal license or getting his boat taken away and himself arrested for illegal shipment. Joe travels to the nearest city, which to him is a new world, as he grew up in the rainforest.

Mimi is a Sicilian dockworker who loses his job when he votes against the Mafia candidate in what he thinks is a secret ballot. He leaves his wife behind and goes to Turin, where he meets and moves in with Fiore, a street vendor and Communist organizer. They have a child, he works non-union jobs, and again he comes to the Mafia’s attention. This time they’re impressed, promoting him to a supervisor’s job back in Sicily. He must keep Fiore and the child a secret, which is fine with Fiore, as long as he never makes love to his wife. He doesn’t, and when she becomes pregnant, he knows he’s a cuckold. His personal revenge and the Mafia’s tentacles then intertwine in tragicomic ways.

A successful businessman goes to Italy to arrange for the return of his tycoon-father’s body only to discover dad died with his mistress of long standing.