Julie Christie
Susan Harris
Fritz Weaver
Alex Harris
Gerrit Graham
Walter Gabler
Berry Kroeger
Petrosian
Lisa Lu
Soong Yen
Larry J. Blake
Cameron
J
John O'Leary
Royce
Alfred Dennis
Mokri
Davis Roberts
Warner
Patricia Wilson
Mrs. Talbert
D
Dana Laurita
Amy
Michelle Stacy
Marlene
Felix Silla
Baby
T
Tiffany Potter
Baby
E
E. Hampton Beagle
Night Operator
M
Michael Glass
Technician
Barbara O. Jones
Technician
M
Monica MacLean
Joan Kemp
Peter Elbling
Scientist
G
Georgie Paul
Housekeeper
Robert Vaughn
Proteus IV (voice) (uncredited)