How many movies have Ben Stein and Dan Aykroyd acted in together?

They have worked on 4 movies together! Their first movie together was Ghostbusters II (1989) and was their highest rated movie together. They have not worked together since Casper (1995). They are most known for their comedy films together.

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Mr. Rugg
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Dr. Raymond Stantz (uncredited)
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Stanley Rosenfeld
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Harry Sultenfuss
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Public Works Official
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Ray Stantz
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