Lionel Barrymore
— Dr. Leonard Gillespie
Van Johnson
— Dr. Randall Adams
Marilyn Maxwell
— Ruth Edley
Keye Luke
— Dr. Lee Wong How
Ava Gardner
— Jean Brown
Alma Kruger
— Molly Bird
Rags Ragland
— Hobart Genet
Nell Craig
— Nurse 'Nosey' Parker
Walter Kingsford
— Dr. Walter Carew
George H. Reed
— Conover
Celia Travers
— Nurse Slidell
James Burke
— First Policeman (uncredited)
George Chandler
— Attendant (uncredited)
Chester Clute
— Mr. Burns (uncredited)
Byron Foulger
— Technician (uncredited)
Sam McDaniel
— Phone Operator (uncredited)