When a group of isolated people in the Greek mountains set off a cave explosion, they are menaced by an invisible shrieking dinosaur that had been buried for eons

This epic Spanish biopic chronicles the life of Cervantes, Spain's great novelist, playwright and poet, during the 16th-century, when as a young man he goes to Italy to become a soldier for the Pope. Later he helps the Pope's emissary wage war against the Spanish Moors. His exploits win him great favor. He falls in love with a famous Italian courtesan and she with him. Unfortunately, the Pope splits them apart with his newest decree which demands that all prostitutes leave the city. Upset, Cervantes goes to fight in the famed sea battle of Lepanto and comes back a hero. Later he is captured by Barbary pirates and ransomed by Trinitarian friars.

When half-breed Indian Yaqui Joe robs an Arizona bank, he is pursued by dogged lawman Lyedecker. Fleeing to Mexico, Joe is imprisoned by General Verdugo, who is waging a war against the Yaqui Indians. When Lyedecker attempts to intervene, he is thrown into prison as well. Working together, the two escape and take refuge in the hills, where Lyedecker meets beautiful Yaqui freedom fighter Sarita and begins to question his allegiances.

William Shatner plays two roles: cowboy Johnny Moon and his ruthless Indian twin brother, Notah. Notah likes peyote and gets the crazy idea that he's the Comanche messiah sent to lead the Comanche nation against the white man but more specifically the dusty desert town of Rio Hondo. Moon, estranged from his brother, decides to stop Notah either by words or by bullets.