Leon Theremin as Self – Inventor of the Theremin

Clara Rockmore as Self – Theremin Virtuoso

Robert Moog as Self – Inventor of the Moog Synthesizer

Nicolas Slonimsky as Self – Composer and Historian

Paul Shure as Self – Musician

Henry Solomonoff as Self – Theremin Studio Member

Suki Bader as Self – Theremin Dancer

Beryl Campbell as Self – Theremin Dancer

Lydia Kavina as Self – Theremin's Niece

Brian Wilson as Self – Founder of The Beach Boys

Todd Rundgren as Self – Musician and Producer

Vladimir Lenin as Self (archive footage)

Ingrid Bergman as Dr. Constance Petersen (archive footage) (uncredited)

Bobby Burgess as Actor in Mickey Mouse Show Clip (archive footage) (uncredited)

Samuel Hoffman as Self – Mickey Mouse Show Clip (archive footage) (uncredited)

Jerry Lewis as Sidney L. Pythias (archive footage) (uncredited)

Ray Milland as Don Birnam (archive footage) (uncredited)

Patricia Neal as Helen Benson (archive footage) (uncredited)

Gregory Peck as John Ballantyne (archive footage) (uncredited)

Michael Rennie as Klaatu (archive footage) (uncredited)

Barbara Rush as Helen Fields (archive footage) (uncredited)

Joe Sawyer as Frank Daylon (archive footage) (uncredited)

Jefferson Dudley Searles as Mr. Crow (archive footage) (uncredited)

Alex Tkaczevski as Self – Translator (uncredited)