Main Cast
- Ray "Crash" Corrigan as Crash Corrigan, Athlete and Navy Lieutenant. Crash Corrigan's stage name came from this serial.
- Lois Wilde as Diana Compton, Reporter from the Times who joins the expedition to Atlantis to get a story
- Monte Blue as Unga Khan, Tyrant and leader of the Black Robes
- William Farnum as Sharad, High priest of Atlantis and leader of the White Robes
- Boothe Howard as Ditmar, one of Unga Khan's Black Robes
- Raymond Hatton as Gasspom, one of Unga Khan's Black Robes
- C. Montague Shaw as Professor Norton, a British-born US scientist and leader of the expedition to Atlantis in his Rocket Submarine
- Lee Van Atta as Billy Norton, Professor Norton's young son who stows away aboard the submarine expedition
- Smiley Burnette as Briny Deep, a sailor in Professor Norton's Rocket Sub expedition and comic relief
- Frankie Marvin as Salty, a sailor in Professor Norton's Rocket Sub expedition and comic relief
Read more about this topic: Undersea Kingdom, Cast
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