How many movies have Hans-Joachim Ketzlin and Ralf Gregan collaborated on?
They have worked on 5 movies together! Their first movie together was Playgirl (1966) while their highest rated movie together was Cold Blood (1975). They have not worked together since Cold Blood (1975). They are most known for their comedy films together.
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Max
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Ninas erster Freund
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007
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