Michael Callan (Dr. Alec Considine)
Cliff Robertson (Dr. John Paul Otis)
James MacArthur (Dr. Lew Worship)
Nick Adams (Dr. Sid Lackland)
Suzy Parker (Lisa Cardigan)
Jud Taylor
Baruch Lumet (Byrd)
Michael Fox (Dr. Greenberg)
Harry Hines (Slattery)
Anne Helm (Mildred)
Peter Brocco (Auer)
Katherine Bard (Nurse Flynn)
Kaye Stevens (Didi Loomis)
Gregory Morton (Dr. Hugo Granchard)
Angela Clarke (Mrs. Auer)
Connie Gilchrist (Nurse Connie Dean)
Ellen Davalos (Loara)
Charles Robinson (Dr. Dave Simon)
John Banner (Dr. Duane)
Mari Lynn (Samantha)
Brian G. Hutton (Dr. Joe Parelli)
J. Edward McKinley (Dr. Bonny)
Bobo Lewis (Gwen)
Bill Gunn (Rosco)
Don Edmonds (Dr. Petchek)
Mavis Neal (Mrs. Lawrence)
Brent Sargent (Dr. Baker)
Haya Harareet (Mado)
Telly Savalas (Dr. Riccio)
Stefanie Powers (Gloria)
Buddy Ebsen (Dr. Sidney Wohl)