How many movies have John Stephenson and William Hanna collaborated on?

They have worked on 20 movies together! Their first movie together was The Man Called Flintstone (1966) while their highest rated movie together was The Adventures of Robin Hoodnik (1972). They have not worked together since Scooby-Doo's Spookiest Tales (2003). They are most known for their animation films together.

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Showroom Announcer
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Executive Producer
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Writer
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Special Appearance
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Mr. Slate
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Director
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Producer
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Story
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William
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Fancy-Fancy / Officer Charlie Dibble / Waiter (voice)
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Executive Producer
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Doggie Daddy / Pelican (voice)
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Executive Producer
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Songs
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Lyricist
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Mr. Slate / Moderator / Investor / Poker Player (voice)
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Executive Producer
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Doggie Daddy / Mr. Dingwell (voice)
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Executive Producer
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Mr. George Nate Slate (voice)
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Executive Producer
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Sloan / Andrew Jackson / Blacksmith (voice)
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Executive Producer
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Richelieu (voice)
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Executive Producer
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Sheriff of Nottingham / Carbuncle (voice)
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Director
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Producer
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Benny the Ball / Doggy Daddy / Hardy Har-Har (voice)
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Director
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Producer
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Mr. Slate / Various Voices (voice)
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Director
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Story