Mole Men Against the Son of Hercules (1961)
Starring: Mark Forest
Plot: Maciste arranges for himself and his new friend Bango 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. But his real challenges have just begun.