Leon Theremin
Self – Inventor of the Theremin
Clara Rockmore
Self – Theremin Virtuoso
Robert Moog
Self – Inventor of the Moog Synthesizer
Nicolas Slonimsky
Self – Composer and Historian
Paul Shure
Self – Musician
Henry Solomonoff
Self – Theremin Studio Member
Suki Bader
Self – Theremin Dancer
Beryl Campbell
Self – Theremin Dancer
Lydia Kavina
Self – Theremin's Niece
Brian Wilson
Self – Founder of The Beach Boys
Todd Rundgren
Self – Musician and Producer
Vladimir Lenin
Self (archive footage)
Ingrid Bergman
Dr. Constance Petersen (archive footage) (uncredited)
Bobby Burgess
Actor in Mickey Mouse Show Clip (archive footage) (uncredited)
Samuel Hoffman
Self – Mickey Mouse Show Clip (archive footage) (uncredited)
Jerry Lewis
Sidney L. Pythias (archive footage) (uncredited)
Ray Milland
Don Birnam (archive footage) (uncredited)
Patricia Neal
Helen Benson (archive footage) (uncredited)
Gregory Peck
John Ballantyne (archive footage) (uncredited)
Michael Rennie
Klaatu (archive footage) (uncredited)
Barbara Rush
Helen Fields (archive footage) (uncredited)
Joe Sawyer
Frank Daylon (archive footage) (uncredited)
Jefferson Dudley Searles
Mr. Crow (archive footage) (uncredited)
Alex Tkaczevski
Self – Translator (uncredited)