A human scientist capable of living underwater discovers similar alien life inhabiting human bodies, and looks to them for a clue to his origin.
Patrick Duffy
as Mark Harris
Belinda Montgomery
as Dr. Elizabeth Merrill
Kenneth Tigar
as Dr. Miller Simon
Alan Fudge
as C.W. Crawford
Tiffany Bolling
as Lioa / Dilly
Annette Charles
as Ginny Mendoza
Burr DeBenning
as Xos / Chazz
