How many movies have Cesare Frugoni and Luciano Martino collaborated on?

They have worked on 5 movies together! Their first movie together was The Virgo, the Taurus and the Capricorn (1977) while their highest rated movie together was Island of the Fishmen (1979). They have not worked together since The Great Alligator (1979). They are most known for their horror films together.