How many movies have Colin Duffy and Jules Bass collaborated on?

They have worked on 1 movie together! Their first movie together was The Year Without a Santa Claus (1974) and was their highest rated movie together. They have not worked together since The Year Without a Santa Claus (1974).

Role
Ignatius Thistlewhite (voice)
Crew
Director
Crew
Producer
Crew
Lyricist