In the 18th century, the pirates of Madagascar, lords of the Republic of Libertatia and masters of the Indian Ocean, live in an impregnable natural fortress, killing, robbing and plundering with impunity, so the British Navy hatches a daring plan to destroy them.

Cast: Errol Flynn, Maureen O'Hara, Anthony Quinn, Alice Kelley, Mildred Natwick, Robert Warwick