How many movies have Charlie Callas and Ron Clark collaborated on?

They have worked on 3 movies together! Their first movie together was Silent Movie (1976) while their highest rated movie together was History of the World: Part I (1981). They have not worked together since History of the World: Part I (1981). They are most known for their comedy films together.

Role
Soothsayer - The Roman Empire
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Stoned Soldier #1 - The Roman Empire
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Cocker Spaniel
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Zachary Cartwright III
Crew
Writer