Cary Grant

~ as ~

Dr. Noah Praetorius

Jeanne Crain

~ as ~

Deborah Higgins

Finlay Currie

~ as ~

Shunderson

Hume Cronyn

~ as ~

Prof. Rodney Elwell

Walter Slezak

~ as ~

Prof. Barker

Sidney Blackmer

~ as ~

Arthur Higgins

Basil Ruysdael

~ as ~

Dean Lyman Brockwell

Katherine Locke

~ as ~

Miss James

Margaret Hamilton

~ as ~

Sarah Pickett (uncredited)

Jack Kelly

~ as ~

Student (uncredited)