In ancient Rome, the people finally oust their despised king, Tarquinius, and declare the city a republic. Tarquinius makes an alliance with the Etruscan king, Porsenna, to take back power in Rome, but a Roman general, the heroic Mucius, sets out to stop him.

A scientist who has invented a weapon capable of disintegrating solid matter is kidnapped by a criminal gang, which intends to sell the scientist and his weapon to the highest bidder. A secret agent and the scientist's daughter set out to track down the kidnappers and rescue the scientist.

The Jews of Jerusalem are driven out by their Syrian rulers. They gather their forces, and return to drive out their oppressors.