The "Trinity" crew makes another modern era film. Plata and Salud are pilots ditching aircraft for insurance money. They wind up crashing for real in the jungles of South America. The plot involves "Mr. Big", who is buying the diamonds from the miners for much too little, and has thugs who keep the price down. Of course, Plata and Salud side with the miners

In 1978, $20 million was stolen from a Detroit bank. One of the robbers was caught, one was found dead, and the third disappeared. The money was never found. Seven years later, the robber who was caught was released from jail. He immediately went to Miami, only to be found dead the next day. Now FBI agents Doug Bennet and Steve Forest have been called in to investigate the case while posing as Miami police officers. Somewhere in Miami the third robber is hiding with his $20 million, and he has a seven-year head start on the authorities.

The town of Newnan are seeing little green men everywhere. The military have arrived and are on the lookout for UFOs. Everyone's high strung and Sheriff Hall (Bud Spencer) is left to deal with the aftermaths of the hysteria. On his way home from patrol he happens upon a little boy claiming to be an alien by the name of H7-25. At first the sheriff doesn't believe the boy, but with the mounting evidence, even he must eventually concede. Soon the military is after Sheriff Hall and H7-25, and it is up to the sheriff to keep the boy safe and beat up large swaths of soldiers so H7-25 can go home.

The "Bulldozer", a former football star, is now working as a fisherman. As a group of street-people arranges a football match against the local Armybase, he is asked to be their trainer. His boat was damaged by a submarine and he currently has no work, so he agrees.

Inspector Rizzo and Marshal Caputo go to Egypt and look for Professor Cerullo, who is missing.

Following the events of The Sheriff and the Satellite Kid, Sheriff Hall and H-725 (using the official identity of Charlie Warren) still get no rest from the military - because the little alien has not yet grasped the meaning of keeping a low profile. They are constantly on the move, and H-725's father has had to pick them out of a tight spot too many times already.

Inspector “Flatfoot” Rizzo investigates crime and corruption in Naples.

Inspector Rizzo in Napoli gets a message from a policeman from South Africa who wants to meet him. Immediately before this meeting the South African policeman is killed. Dying he shows Rizzo a picture of his young son Bodo. Rizzo travels to Johannesburg to find out what the policeman was working on and to find Bodo.

Inspector Rizzo is accused of drug trafficking. In order to clear his name he has to find out who is the person, from a Mafia ring, who has infiltrated his police department.

Island farmer Banana Joe helps the local community by trading his bananas for goods. When gangsters arrive with plans to construct a banana processing plant, Joe kicks them out, but the mob boss discovers that Joe is operating without a license. After the mob tips off the authorities and Joe's boat is impounded, he ventures into a big city for the first time to seek help.