How many movies have Tony Sgroi and William Hanna collaborated on?

They have worked on 3 movies together! Their first movie together was Alice in Wonderland or What's a Nice Kid Like You Doing in a Place Like This? (1966) while their highest rated movie together was Rock Odyssey (1987). They have not worked together since A Flintstones Christmas Carol (1994). They are most known for their animation films together.