Race-car driver Blaine Striker grows concerned about his younger brother, a student at a medical school on the Caribbean island of St. Heron. General Turner has led a violent coup on this island and may be planning to blow up the school in order to blame the destruction on counterrevolutionaries. Striker infiltrates St. Heron, is captured, stripped to his tighty-whiteys, and electrotortured. He escapes, joins forces with the counterrevolutionaries, and foils a plot to assemble Russian missiles on the island.
After her boyfriend is murdered by the gangsters whose diamonds he stole, a girl is protected by two FBI agents who plan to keep her from sharing the same fate.
A masked superhero (Michael Coby) with a private-eye disguise thwarts a madman's (Cameron Mitchell) death-ray plot.
A trio of American adventurers marooned in rural Mexico are recruited by a beautiful woman to rescue her husband from Apaches.
When his girlfriend dies of a drug overdose, a former Green Beret decides to take vengeance on the drug gangs responsible for her death.