Caterina finds out that her husband Peter Tzar of Russia, is plotting to kill her. She sets Count Orlov free from prison, Peter's sworn enemy, becomes empress of Russia and leads the Cossacks army against him.

Professor Freeman is an important English scientist that is investigating a method to treat cancer. His daughter is killed in the swimming pool of a hotel in Beirut. The case is confidential so that the mission is entrusted to the Special Agent Mikel Brown.

Adventurer Clint travels across Borneo with a bunch of rogues and geologists on the search for a diamond mine. In the middle of the jungle, they meet a beautiful woman called Samoa. Hardly a surprise that Clint falls in love with Samoa, but trouble with the natives begins when the diamonds are found because diamonds are holy stones to them.

Maciste and his people flee their volcano-ravaged island. They end up caught in between two warring tribes.

Spaghetti Western icon Anthony Steffen stars as Shenandoah, a man of mystery who joins a vicious band of highwaymen after passing a near impossible and death defying initiation. When the gang begins to suspect Shenandoah may be a traitor in their midst; they learn the real reason he joined their degenerate gang of thieves: retribution.