Christopher Walken

as Michael Brace

Natalie Wood

as Karen Brace

Louise Fletcher

as Lillian Reynolds

Cliff Robertson

as Alex Terson

Jordan Christopher

as Gordy Forbes

Donald Hotton

as Landan Marks

Alan Fudge

as Robert Jenkins

Joe Dorsey

as Hal Abramson

Bill Morey

as James Zimbach

Jason Lively

as Chris Brace

Darrell Larson

as Security Technician

Lou Walker

as Chef

Stacey Kuhne-Adams

as Andrea

John Hugh

as Animal Lab Technician

Ira David Wood III

as Barry (as David Wood)

Keith Colbert

as Dr. Ted Harris

Jerry Bennett

as Dr. Janet Bock

Mary Fran Lyman

as Realtor (as Mary-Fran Lyman)

Jack Harmon

as Security Guard

Nina Axelrod

as Simulator Technician

Lana Clarkson

as Food Fantasy Girl (uncredited)

George Sasaki

as Scientist (uncredited)