David Bowie
Thomas Jerome Newton
Rip Torn
Nathan Bryce
Candy Clark
Mary-Lou
Tony Mascia
Arthur
Buck Henry
Oliver Farnsworth
Bernie Casey
Peters
Adrienne La Russa
Helen
Claudia Jennings
Peters' Wife (uncredited)
Rick Riccardo
Trevor
Jim Lovell
James Lovell
H
Hilary Holland
Jill
L
Linda Hutton
Elaine
J
Jackson D. Kane
Professor Canutti
L
Lilybelle Crawford
Jewelery Store Owner
R
Richard Breeding
Receptionist
A
Albert Nelson
Waiter
P
Peter Prouse
Peters' Associate