How many movies have Hajime Koizumi and Reuben Bercovitch collaborated on?

They have worked on 3 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 The War of the Gargantuas (1966). They are most known for their science fiction films together.