How many movies have John Marlin and William H. O'Brien acted in together?

They have worked on 6 movies together! Their first movie together was Gentlemen Prefer Blondes (1953) and was their highest rated movie together. They have not worked together since Support Your Local Gunfighter (1971). They are most known for their comedy films together.

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Townsman (uncredited)
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Old Chess Player (uncredited)
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Waiter (uncredited)
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Bartender (uncredited)
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Audience Member (uncredited)
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Audience Member (uncredited)
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Waiter (uncredited)
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Ship Passenger (uncredited)