Robert Cummings

~ as ~

George Petty, aka Andrew 'Andy' Tapp

Joan Caulfield

~ as ~

Prof. Victoria Braymore

Elsa Lanchester

~ as ~

Dr. Crutcher

Melville Cooper

~ as ~

Beardsley (Petty's butler, aka Uncle Ben)

Audrey Long

~ as ~

Mrs. Connie Manton Dezlow

Mary Wickes

~ as ~

Prof. Whitman

Frank Orth

~ as ~

Moody (process server)

John Ridgely

~ as ~

Patrolman

Dorothy Abbott

~ as ~

December Petty Girl (uncredited)

Gino Corrado

~ as ~

Brush and Easel Waiter (uncredited)