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Harold Lloyd Dr. 'Jack' Jackson

Mildred Davis The Sick-Little-Well-Girl

John T. Prince Charles F. Haskell - Her Father

Eric Mayne Dr. Ludwig von Saulsbourg

C. Norman Hammond Jamison - the Lawyer

Jackie Condon Boy's Pal (uncredited)

Mickey Daniels Boy Patient (uncredited)

Richard Daniels Man (uncredited)

William Gillespie Card Player (uncredited)

Wally Howe Asylum Guard (uncredited)

James T. Kelley Card-Playing Father (uncredited)

'Auntie' Mackay Undetermined Secondary Role (uncredited)

Florence Mayon Card Player's Daughter (uncredited)

Oscar Morgan Undetermined Secondary Role (uncredited)

Charles Stevenson Asylum Guard (uncredited)

Anna Townsend Jamison's Mother (uncredited)