Doctor Jack Cast and Crew
 Harold Lloyd - (Dr. Jackson) |
 Mildred Davis - (Miss Haskell) |
| John T. Prince - (Charles Haskell) |
| Eric Mayne - (Dr. Ludwig von Soulsbourg) |
| C. Norman Hammond - (The Lawyer) |
| Mrs. Anna Townsend - (The Lawyer's Mother) |
| Jackie Condon - (Boy's pal) |
| Mickey Daniels - (Boy patient) |
| Richard Daniels - (Man) |
| William Gillespie - (Man) |
| Charles E. Stevenson - (Asylum guard) |
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