Roaming the vast jungles of Congo with his best friend, Bongo the gorilla, Antonio della Buffas, a mysterious man whom the natives call the "white monkey", is utterly unaware that he is the long-lost son of a wealthy explorer. Then, three opportunists manage to capture and bring the white savage to civilisation, bent on getting their hands on his immense fortune.

Alberto loves Maria, daughter of Arturo, a rich owner of boats, his love is reciprocated by the girl and has the approval of her father.

Roberto Maldi, a young scientist, is trying to find a serum capable of giving courage but he unwittingly invents a serum which transforms any man in a womanizer. His boss scents a good business and wants to produce the serum on industrial basis, but Roberto does not agree.