Julie Christie
Susan Harris
Fritz Weaver
Alex Harris
Gerrit Graham
Walter Gabler
Berry Kroeger
Petrosian
Lisa Lu
Soong Yen
Larry J. Blake
Cameron
John O'Leary
Royce
Alfred Dennis
Mokri
Patricia Wilson
Mrs. Talbert
Michelle Stacy
Marlene
Felix Silla
Baby
Peter Elbling
Scientist
Robert Vaughn
Proteus IV (voice) (uncredited)
Davis Roberts
Warner
Dana Laurita
Amy
Tiffany Potter
Baby
E. Hampton Beagle
Night Operator
Michael Glass
Technician
Barbara O. Jones
Technician
Monica MacLean
Joan Kemp
Georgie Paul
Housekeeper
