Maciste arranges for himself and his new friend Bangor to be captured by a mysterious band of white-clad marauders and taken to an underground city. There the two are forced to turn an enormous wheel along with other captives as part of a gold-and-diamonds mining operation. The underground city's queen, Halis Mosab, takes note of the handsome, muscular Maciste and chooses him to be her consort if he can meet such challenges as saving the kidnapped Princess Saliura from a gigantic ape. Maciste kills the ape and carries Saliura back to the aboveground world. The white-clad marauders can't follow them if it means being caught in the sunlight which instantly dissolves them. Maciste then returns to the underground city to save the other captives. Meanwhile, high priest Kahab informs his son, Katar, that their queen is not one of them but, unbeknownst to her, was kidnapped as a small child from the "world above." If Katar can marry her...

Five GIs end up in a female college during their military manouvers. They are very welcome by the girls and since one of them has also a beautiful voice they take part in a show organized by the college.

Strongman Maciste must battle the one-eyed Cyclops monster that is ravaging the land of Sadok, while at the same time fending off the advances of the evil Queen Capys, who wants to do a little ravaging of her own.