Captain Sindbad was based on an Arabian Nights story, was filmed in Germany, and starred an American leading man (Guy Williams), a German leading lady (Heidi Bruhl) and a Mexican villain (Pedro Armendariz). How's that for cultural diversity? Anyway, the story involves Sindbad's (Williams) efforts to enter the impenetrable castle where the evil El Kerim's (Armendariz) heart is being kept. So long as his heart is outside his body, El Kerim is invulnerable, enabling him to be as wicked and despotic as he chooses. Sindbad comes to the rescue just seconds before the heroine (Bruhl) is about to be crushed to death by an elephant. Despite the mortality rate on both sides, Captain Sindbad is pure kiddie-matinee stuff, adroitly put together by director/cinematographer Byron (War of the Worlds) Haskin and boasting top-notch special effects.
~ Hal Erickson, All Movie Guide