Undersea Kingdom (1936)

Unga Khan: Recall the troops. With those religious fanatics under control, I'll have no more interference with my plans to destroy the upper world!

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Sharad: There will be no peace in Atlantis until we have broken the power of this evil usurper, Unga Khan.

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Prof. Norton: And this was where the ancient continent of Atlantis was reported to have sunk thousands of years ago. Contrary to popular belief, Atlantis did not sink overnight, but during a period of years. During this time, the people had ample opportunity to construct a roof of orecalcum over the city and keep out the ocean waves. Thus Atlantis, though lost, still lives.

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An edited, 100-minute long feature version called "Sharad of Atlantis" was made for television
When Republic Studios learned that Universal was producing their "Flash Gordon" serial, they rushed this serial, using similar plot elements, into production.
The Volkite robots here, refurbished, became the "Republic Robot" that debuted in Mysterious Doctor Satan.
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