Gillespie has to finally choose his official assistant, or Red and Lee are going to kill themselves in competition. So, it's another diagnosis competition. Lee's assignment is a small girl who falls ill whenever she eats candy. Red has to cure a girl's mother of a debilitating case of arthritis. But when Red needs Lee's help, will either one live with Gillespie's choice?
| Actor | Role |
|---|---|
 Lionel BarrymoreDr. Leonard Gillespie | Dr. Leonard Gillespie |
 Van JohnsonDr. Randall Adams | Dr. Randall Adams |
 Marilyn MaxwellRuth Edley | Ruth Edley |
 Keye LukeDr. Lee Wong How | Dr. Lee Wong How |
 Ava GardnerJean Brown | Jean Brown |
 Alma KrugerMolly Bird | Molly Bird |
 Rags RaglandHobart Genet | Hobart Genet |
 Nell CraigNurse 'Nosey' Parker | Nurse 'Nosey' Parker |
 Walter KingsfordDr. Walter Carew | Dr. Walter Carew |
 George H. ReedConover | Conover |
| CCelia TraversNurse Slidell | Nurse Slidell |
 James BurkeFirst Policeman (uncredited) | First Policeman (uncredited) |
 George ChandlerAttendant (uncredited) | Attendant (uncredited) |
 Chester CluteMr. Burns (uncredited) | Mr. Burns (uncredited) |
 Byron FoulgerTechnician (uncredited) | Technician (uncredited) |
 Sam McDanielPhone Operator (uncredited) | Phone Operator (uncredited) |