Michael Callan
— Dr. Alec Considine
Cliff Robertson
— Dr. John Paul Otis
James MacArthur
— Dr. Lew Worship
Suzy Parker
— Lisa Cardigan
Nick Adams
— Dr. Sid Lackland
Haya Harareet
— Dr. Madolyn Bruckner
Anne Helm
— Mildred
Stefanie Powers
— Gloria Mead
Buddy Ebsen
— Dr. Sidney Wohl
Telly Savalas
— Dr. Dominic Riccio
Connie Gilchrist
— Connie Dean
Katharine Bard
— Vicky Flynn
Kaye Stevens
— Didi Loomis
Angela Clarke
— Mrs. Auer
Gregory Morton
— Dr. Hugo Granchard
Mary Grace Canfield
— Pharmacy Nurse
Harry Holcombe
— Dr. Hempner
Jesslyn Fax
— Mrs. Hitchcock
Brian G. Hutton
— Dr. Joe Parelli
Bill Gunn
— Rosco
William Douglas
— Dr. Apschult
Hope Sansberry
— Grey Lady
Don Marshall
— Intern
Baruch Lumet
— Byrd
Jud Taylor
— Dr. Van Wyck
Juli Reding
— Party Girl (uncredited)