Shortly after his discovery of the Tomb of Ra-Antef, Professor Dubois is murdered in the Egyptian desert. Disregarding all the threats and warnings, Alexander King (Fred Clark), an American showman and the financial backer of the expedition, arranges to have the mummiform coffin of the young pharaoh sent on tour through Europe and the United States. But on the first night of the show, King cuts the seals of the mummy of Ra-Antef and finds that the coffin is empty. With the mummy alive and on the rampage, King, socialite Adam Beauchamp (Terence Morgan), and others fall victim to its curse, leaving only Annette Dubois (Jeanne Roland) and John Bray (Ronald Howard) able to bring this fantastic story to an end.