A human scientist capable of living underwater discovers similar alien life inhabiting human bodies, and looks to them for a clue to his origin.
Mark Harris
Dr. Elizabeth Merrill
Dr. Miller Simon
C.W. Crawford
Lioa / Dilly
Ginny Mendoza
Xos / Chazz
Boy
Grant Stockwood
Sub Captain Wes
Medical Examiner
Second Officer
Air Lock Man
Herb Wayland
Lou
Hot Tub Manager
Myrtle
Fish Store Clerk
