How many movies have Keiichi Hasegawa and Tetsuzô Ôsawa collaborated on?

They have worked on 4 movies together! Their first movie together was Ultraman Cosmos 2: The Blue Planet - Young Musashi Chapter (2002) while their highest rated movie together was Ultraman Mebius & Ultra Brothers (2006). They have not worked together since Superior Ultra 8 Brothers (2008). They are most known for their science fiction films together.