After completing his voyages Sindbad the Sailor and his hearty crew have come home to find a palace coup d'etat has occurred and his home city is being run by a brutal dictator played by Pedro Armendariz. He's got designs on the beautiful young princess, Heidi Bruhl both lustful and political.
Captain Sindbad which appears to be a joint German-American production stars Guy Williams who if he had come along a decade earlier might well have inherited the mantle of Errol Flynn. He certainly was a dashing Zorro for Walt Disney television.
Williams's greatest challenge was keeping a straight face through a lot of very hokey dialog which he does admirably. Armendariz is invincible, we see proof of that when Williams runs a scimitar through him and he doesn't flinch. Finding out the secret of Armendariz's invincibility and rescuing his princess from a fate worse than death is the sum and substance of the film.
I remember seeing this in the theater when it first came out and liked it. I still like it somewhat, but I certainly was a lot younger in 1963.
The special effects are good, not DeMille or Harryhausen quality, but still good. I fear though that the hokeyness of the script will probably limit Captain Sindbad to the juvenile trade.