How many movies have Shintarō Katsu and Yoshihiko Aoyama acted in together?

They have worked on 5 movies together! Their first movie together was The Thieves' Who's Who (1966) while their highest rated movie together was Zatoichi's Cane Sword (1967). They have not worked together since Zatoichi in Desperation (1972). They are most known for their action films together.