How many movies have Haruo Nakajima and Reuben Bercovitch collaborated on?

They have worked on 4 movies together! Their first movie together was Frankenstein Conquers the World (1965) while their highest rated movie together was Invasion of Astro-Monster (1965). They have not worked together since What's Up, Tiger Lily? (1966). They are most known for their science fiction films together.