Hercules Unchained (Ercole e la regina di Lidia) is a 1959 Italian-Franco-Spanish adventure fantasy film. It features Steve Reeves, Sylva Koscina, Gabriele Antonini, and Patrizia Della Rovere.
En route to Thebes for an important diplomatic mission, Hercules drinks from a magic spring and loses his memory. He spends most of the story in the pleasure gardens of Queen Omphale of Lydia. While young Ulysses tries to help him regain his memory, political tensions escalate in Thebes, and Hercules' new wife Iole finds herself in mortal danger.