El doctor Jack

Harold Lloyd

Dr. 'Jack' Jackson

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Mildred Davis

The Sick-Little-Well-Girl

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John T. Prince

Charles F. Haskell - Her Father

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Eric Mayne

Dr. Ludwig von Saulsbourg

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C. Norman Hammond

Jamison - the Lawyer

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Jackie Condon

Boy's Pal (uncredited)

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Mickey Daniels

Boy Patient (uncredited)

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Richard Daniels

Man (uncredited)

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William Gillespie

Card Player (uncredited)

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Wally Howe

Asylum Guard (uncredited)

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