Susan Harris

Julie Christie

Acting

Alex Harris

Fritz Weaver

Acting

Walter Gabler

Gerrit Graham

Acting

Petrosian

Berry Kroeger

Acting

Soong Yen

Lisa Lu

Acting

Cameron

Larry J. Blake

Acting

Royce

John O'Leary

Acting

Mokri

Alfred Dennis

Acting

Warner

Davis Roberts

Acting

Mrs. Talbert

Patricia Wilson

Acting

Amy

Dana Laurita

Acting

Marlene

Michelle Stacy

Acting

Baby

Felix Silla

Acting

Baby

Tiffany Potter

Acting

Night Operator

E. Hampton Beagle

Acting

Technician

Michael Glass

Acting

Technician

Barbara O. Jones

Acting

Joan Kemp

Monica MacLean

Acting

Scientist

Peter Elbling

Acting

Housekeeper

Georgie Paul

Acting

Proteus IV (voice) (uncredited)

Robert Vaughn

Acting