How many movies have Enid L. Kantor and Rockne S. O'Bannon collaborated on?

They have worked on 3 movies together! Their first movie together was Alien Nation: Dark Horizon (1994) while their highest rated movie together was Alien Nation: The Enemy Within (1996). They have not worked together since Alien Nation: The Udara Legacy (1997). They are most known for their science fiction films together.