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.

In 1950, in Africa. Tom organizes safaris for tourists, secretly equipping them with guns loaded with blanks. When Slim, Tom’s cousin—a sly slacker and staunch environmentalist—arrives, the two men come into conflict with Jack Ormond, a local animal trafficker. A doctor, a friend of the duo, denounces Mr. Ormond’s exploitation of animals in a newspaper, prompting Ormond to send his henchmen to destroy the clinic where the good doctor practices. But at the medical facility, Ormond’s henchmen find Tom and Slim waiting for them, and in the blink of an eye, the two cousins wipe out these thugs in a brawl. Ormond then tries to bribe the two cousins, and when that fails, has them imprisoned for a theft they never committed. After escaping from prison, the two men rush toward Ormond’s ship, beating the merchant’s men to a pulp...