How many movies have Joseph Barbera and Len Janson collaborated on?
They have worked on 1 movie together! Their first movie together was The Hanna-Barbera Hall of Fame: Yabba Dabba Doo II (1979) and was their highest rated movie together. They have not worked together since The Hanna-Barbera Hall of Fame: Yabba Dabba Doo II (1979).
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