Lt. Glenn Hoffmann is the the fun-loving leader of a bunch of oddball, acrobatic G.I.s whose mission is to steal the German's secret attack plans from a villa behind enemy lines, where they run into a brutal Nazi commander.

Bandits ambush Capt. Roy Dexter of the U.S. Cavalry while he and his men escort a fortune in Confederate gold coins. Only Dexter survives the attack. He's subsequently sentenced to life in prison on the false belief he masterminded the ambush. Escaping from prison, Dexter sets about tracking down and exposing the true culprits.

Maciste's village is attacked by pirates. The women, including Maciste's fiancee Guja, are carried off to Salmanak, where dwells the lair of the blood drinking Kobrak. Maciste vows to rescue them.