Barbara Steele

as Princess Asa Vajda / Katia Vajda

John Richardson

as Dr. Andrej Gorobec / Dr. Andreas Gorobec

Andrea Checchi

as Dr. Choma Kruvajan / Dr. Thomas Kruvajan

Ivo Garrani

as Prince Vajda

Arturo Dominici

as Igor Javutich / Javuto

Enrico Olivieri

as Prince Constantine Vajda

Antonio Pierfederici

as Priest

Tino Bianchi

as Ivan - Manservant