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