By the Gods!

Lidia Alfonsi as the Sybil in HERCULES (1958)

Though this happens 13 minutes in the movie, I feel the movie really comes alive here, not that it wasn't good prior to this scene. It was but the story really kicked in once we get to meet her. She didn't appear in the sequel HERCULES UNCHAINED (1959) which was a shame because her presence really set the mysticism right: the Gods are always toying with mortals. I like the B&W photo above. Contrasting the B&W photo with the vibrant color as seen in the final film is interesting. IMO, either way she was mesmerizing. Her character 'inspired' a character in the GAME OF THRONES series. Alfonsi is still alive today.