- Monty Woolley - Dr. Lane-Porteus
- Pierre Watkin - Mr. Robert Chanler
- Nella Walker - Mrs. Chanler
- Murray Alper - Blue Swan Waiter (uncredited)
- Don 'Red' Barry - Dr. Collins (uncredited)
- Granville Bates - Harry Cook (uncredited)
- Barbara Bedford - Nurse (uncredited)
- Margaret Bert - Little Boy's Mother (uncredited)
- Marie Blake - Miss Sally Green (uncredited)
- Virginia Brissac - Boardinghouse Landlady (uncredited)
- John Butler - Coronary Patient (uncredited)
- Don Castle - Dr. Bates (uncredited)
- Roger Converse - Dr. Joiner (uncredited)
- Nell Craig - Nurse Parker (uncredited)
- Frank Dae - President, Board of Directors (uncredited)
- Bess Flowers - Nurse (uncredited)
- Brenda Fowler - Head Nurse (uncredited)
- Harrison Greene - Bartender (uncredited)
- Howard Hickman - Dr. Harris (uncredited)
- Cy Kendall - Charlie (uncredited)
- Mary MacLaren - Lodger Bringing Blanket (uncredited)
- James Pier Mason - Lodger Going for Ambulance (uncredited)
- Tom McGuire - Clancy (uncredited)
- Jack Murphy - Intern (uncredited)
- Frank Orth - Mike Ryan (uncredited)
- Leonard Penn - Albert Foster (uncredited)
- Cyril Ring - Intern (uncredited)
- Clinton Rosemond - Conover (uncredited)
- Gilbert Russell - Intern (uncredited)
- Edwin Stanley - Resident Doctor (uncredited)
- Phillip Terry - Dr. Vickery (uncredited)
- Emmett Vogan - Detective Herman (uncredited)
- Bobs Watson - Little Boy (uncredited)
- Jack Woody - Ed (uncredited)
- William Worthington - Board Member (uncredited)
-
Harold S. Bucquet
- Max Brand
- David Snell
- Douglas Shearer
Lionel Barrymore interpreta a Dr. Leonard Gillespie en la película.
Lew Ayres hace el papel de Dr. James Kildare.
Lynne Carver interpreta a Alice Raymond en la película.
Nat Pendleton interpreta a Joe Wayman en la película.
Jo Ann Sayers interpreta a Barbara Chanler en la película.
Samuel S. Hinds hace el papel de Dr. Stephen Kildare.
Emma Dunn interpreta a Mrs. Martha Kildare en la película.
Walter Kingsford hace el papel de Dr. P. Walter Carew.
Truman Bradley interpreta a Jack Hamilton en la película.
Monty Woolley interpreta a Dr. Lane-Porteus en la película.
Pierre Watkin interpreta a Mr. Robert Chanler en la película.
Nella Walker hace el papel de Mrs. Chanler.
Murray Alper interpreta a Blue Swan Waiter (uncredited) en la película.
Don 'Red' Barry interpreta a Dr. Collins (uncredited) en la película.
Granville Bates interpreta a Harry Cook (uncredited) en la película.
Barbara Bedford interpreta a Nurse (uncredited) en la película.
Margaret Bert interpreta a Little Boy's Mother (uncredited) en la película.
Marie Blake interpreta a Miss Sally Green (uncredited) en la película.
Virginia Brissac interpreta a Boardinghouse Landlady (uncredited) en la película.
John Butler hace el papel de Coronary Patient (uncredited).
Don Castle interpreta a Dr. Bates (uncredited) en la película.
Roger Converse hace el papel de Dr. Joiner (uncredited).
Nell Craig interpreta a Nurse Parker (uncredited) en la película.
Frank Dae interpreta a President, Board of Directors (uncredited) en la película.
Bess Flowers interpreta a Nurse (uncredited) en la película.
Brenda Fowler interpreta a Head Nurse (uncredited) en la película.
Harrison Greene hace el papel de Bartender (uncredited).
Howard Hickman interpreta a Dr. Harris (uncredited) en la película.
Cy Kendall interpreta a Charlie (uncredited) en la película.
Mary MacLaren interpreta a Lodger Bringing Blanket (uncredited) en la película.
James Pier Mason interpreta a Lodger Going for Ambulance (uncredited) en la película.
Tom McGuire hace el papel de Clancy (uncredited).
Jack Murphy hace el papel de Intern (uncredited).
Frank Orth interpreta a Mike Ryan (uncredited) en la película.
Leonard Penn hace el papel de Albert Foster (uncredited).
Cyril Ring interpreta a Intern (uncredited) en la película.
Clinton Rosemond interpreta a Conover (uncredited) en la película.
Gilbert Russell hace el papel de Intern (uncredited).
Edwin Stanley interpreta a Resident Doctor (uncredited) en la película.
Phillip Terry hace el papel de Dr. Vickery (uncredited).
Emmett Vogan interpreta a Detective Herman (uncredited) en la película.
Bobs Watson hace el papel de Little Boy (uncredited).
Jack Woody hace el papel de Ed (uncredited).
William Worthington interpreta a Board Member (uncredited) en la película.
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