Woody Allen as Miles Monroe

Diane Keaton as Luna Schlosser

John Beck as Erno Windt

Mary Gregory as Dr. Melik

Brian Avery as Herald Cohen

Don Keefer as Dr. Tryon

Mews Small as Dr. Nero

Peter Hobbs as Dr. Dean

Spencer Milligan as Jeb Hrmthmg

John McLiam as Dr. Agon

Bartlett Robinson as Dr. Orva

Chris Forbes as Rainer Krebs

Susan Miller as Ellen Pogrebin

Lou Picetti as Master of Ceremonies

Jessica Rains as Woman in the Mirror

Stanley Ross as Sears Swiggles

Douglas Rain as Bio Central Computer 2100, Series G (voice)

John Cannon as Various Voice-Overs (voice, uncredited)