Scientists (Victor Kilian, Bruce Kellogg, Otto Waldis) drill down in a "cyclotram" to find a fallout shelter at the center of the Earth.
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https://www.youtube.com/watch?v=otXhdWDM6N8
A married couple (Nancy Hadley and Robert Webber) from New York rent an old house along the New England coast that the locals consider a very unhappy place.
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https://www.youtube.com/watch?v=VcSwc1mCAoI
After murdering his wife (Yvette Mimieux, in her debut), a man continually sees the image of Pippo the Clown (Mickey Shaughnessy), whom she befriended, in reflections, trying to strangle him.
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https://www.youtube.com/watch?v=-GSDzaDCznM
The professional gambler Ross Hadley is the owner of a posh gaming establishment in the heart of New York. Hadley's main antagonist is his childhood friend Mike McGlennon. McGlennon, now a police lieutenant, is determined to stop the gambling activities of Hadley. Hadley's and McGlennnon's relationship becomes more complex, when they notice, that they both are in love with the attractive Mary Hayes. Mary sings in nightclubs under the stage name 'Vi Parker'.
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https://www.youtube.com/watch?v=OnAnQdY-sxE
When Jerry receives a letter written entirely in Chinese, he and Pam go to Chinatown to find someone who will translate the letter. Instead they find the proverbial hornets' nest.
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https://www.youtube.com/watch?v=PWvWNcgl2J8