Ward Bond
as Motorcycle Cop at Jail (uncredited)
Cary Grant
as Dr. David Huxley
Katharine Hepburn
as Susan Vance
May Robson
as Aunt Elizabeth Random
Fritz Feld
as Dr. Fritz Lehman
Barry Fitzgerald
as Mr. Gogarty
Walter Catlett
as Constable Slocum
Charlie Ruggles
as Major Horace Applegate