Cary Grant

Dr. Noah Praetorius

Jeanne Crain

Deborah Higgins

Finlay Currie

Shunderson

Hume Cronyn

Prof. Rodney Elwell

Walter Slezak

Prof. Barker

Sidney Blackmer

Arthur Higgins

Basil Ruysdael

Dean Lyman Brockwell

Katherine Locke

Miss James

Margaret Hamilton

Sarah Pickett (uncredited)

Jack Kelly

Student (uncredited)

Paul Lees

Student (uncredited)

Leon Tyler

Student (uncredited)

Jo Gilbert

Nurse (uncredited)

Tina Blagoi

Concertgoer (uncredited)

Helen Dickson

Concertgoer (uncredited)