Upon his return from battle in the previous film, the great warrior Hercules learns that his lover, Daianara, has lost her senses. Acording of the oracle Medea, Dianara's only hope is the Stone of Forgetfulness which lies deep in the realm of Hades. Hercules, with two companions, Theseus and Telemachus, embarks on a dangerous quest for the stone, while he is unaware that Dianara's guardian, King Lico, is the one responsible for her condition and plots to have the girl for himself as his bride upon her revival.
Hercules in the Haunted World is a 1961 Italian sword-and-sandal film directed by Mario Bava. British bodybuilder Reg Park plays Hercules while British actor Christopher Lee appears as Hercules' nemesis Lico. Shooting at Cinecittà, director Mario Bava used some of the same sets from the earlier Hercules and the Conquest of Atlantis which also stars Park.
