Tired of the escapades on earth by his daughter Venus, Jupiter, the god of Lightning, decides he shall marry her soon to one of the candidates: Maciste, a mortal working in Vulcano's cave, and Mars, the god of War. But Mars abducts Venus, allied with Pluto and Eris, and works out a plan involving a bamboo tower high enough for the soldiers of the Thracian King to attack Jupiter in the Olympus.