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.
Reg Park
as Hercules (Ercole)
Christopher Lee
as King Lico (Licos)
Leonora Ruffo
as Princess Deianira
George Ardisson
as Thesus (Teseo)
Marisa Belli
as Aretusa
Ida Galli
as Persephone
Franco Giacobini
as Telemachus (Telemaco)
Mino Doro
as Keros
Rosalba Neri
as (credit only)
Monica Neri
as Helena (uncredited)
Ely Drago
as Jocasta
Gaia Germani
as Medea
