Undersea Kingdom (1936)

Diana Compton: Are you actually proposing to move this huge metal tower? Why?
Unga Khan: Because it contains all the machinery that has enabled me to harness the atom, the most destructive force known to science. Once I reach the surface I will become the ruler of the upper world... or destroy it!
Diana Compton: Professor Norton would never agree to such a fiendish plan!
Prof. Norton: He's insane if he thinks I will.
Unga Khan: We have ways of persuading people to do our bidding.

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Prof. Norton: There was that signal again. They've been sending it every five minutes.
Diana Compton: They? Just whom do you mean by they?
Crash Corrigan: Professor Norton maintains that these signals must be the work of some human agency apparently coming from the bottom of the ocean
Diana Compton: I hope you're not going to spring that fantastic yarn about the lost continent of Atlantis.
Prof. Norton: Exactly - only now I have some definite evidence.

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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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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.
The serial was completed in 25 days.
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