First aired: Mar/05/1972
Director: Jud Taylor
Guest star: Jill Banner (Girl), Jane Wyman (Dr. Amanda Fallon), David Hartman (Dr. Paul Hunter), Mike Farrell (Dr. Vic Wheelwright), Lynette Mettey (Dee Merlino), Robert Walden (Dr. Martin Cohen), Jim Davis (Peter Merlino), Ron Howard (Cory Merlino ((as Ronny Howard))), E. G. Marshall (Dr. David Craig), Lillian Lehman (Nurse Crawford), Robert Hogan (Jack Merlino), Michael Laird (Jonathan), John Saxon (Dr. Ted Stuart)

30 :04x01 - Five Days in the Death of Sgt. Brown (2)

First aired: Sep/19/1972

31 :04x02 - Is This Operation Necessary?

First aired: Sep/26/1972
Director: John Badham

32 :04x03 - A Nation of Human Pincushions

First aired: Oct/03/1972
Director: John Badham
Guest star: Carl Reiner (Arthur Gravis)

33 :04x04 - Time Bomb in the Chest

First aired: Oct/10/1972
Guest star: Johnny Lee (Noah Stedman)

34 :04x05 - A Standard for Manhood

First aired: Oct/17/1972
Writer: Robert E. Collins
Director: Daryl Duke
Guest star: Frank Converse (Curt), Shirley Knight (Marci)

Curt thought it was just too much business pressure, and that just maybe, he'd been married to Marci too long. It was time to cut loose, like the good old football days and try some of the beautiful girls that were always available. But when he failed there, too, he became desperate. He couldn't talk about it it to his old school buddy, Dr. Paul Hunter. An accident landed him in the hospital and they discovered the brain tumor. The operation was a success but the patient was still a failure in the bedroom. His marriage was headed for the rocks - unless Dr. Hunter could make him reach out for help.

35 :04x06 - A Substitute Womb

First aired: Oct/24/1972

36 :04x07 - A Very Strange Triangle

First aired: Oct/31/1972

37 :04x08 - A Quality of Fear

First aired: Nov/14/1972
Guest star: Richard Anderson (Dr. Lensky)

38 :04x09 - An Inalienable Right to Die

First aired: Nov/28/1972

39 :04x10 - A Purge of Madness

First aired: Dec/05/1972

40 :04x11 - End Theme

First aired: Dec/12/1972
Director: John Badham

41 :04x12 - The Velvet Trap

First aired: Dec/19/1972
Writer: Ron Bishop

42 :04x13 - Terminal Career

First aired: Jan/02/1973

43 :04x14 - A Tightrope to Tomorrow

First aired: Jan/09/1973

44 :04x15 - The Night Crawler

First aired: Jan/16/1973

45 :04x16 - And Other Things I May Not See

First aired: May/04/1973
Guest star: David Hartman (Dr. Paul Hunter), Robert Walden (Dr. Martin Cohen), Jane Wyman (Dr. Amanda Fallon), Kathleen Nolan ( ((as Kathy Nolan))), E. G. Marshall (Dr. David Craig), Leslie Nielsen (Unknown)