4x1 - A Fragile Possession

September 12, 1972

4x2 - Love Is When They Say They Need You

September 19, 1972

4x3 - We'll Walk Out of Here Together

September 26, 1972

4x4 - In Sickness and In Health

October 3, 1972

4x5 - House of Mirrors

October 10, 1972

4x6 - He Could Sell Iceboxes To Eskimos

October 17, 1972

4x7 - The Wednesday Game

October 24, 1972

4x8 - Don and Denise

October 31, 1972

4x9 - Please Don't Send Flowers

November 14, 1972

4x10 - With A Shout, Not A Whimper

November 21, 1972

4x11 - Jason Be Nimble, Jason Be Quick

November 28, 1972

4x12 - Unto the Next Generation

December 5, 1972

4x13 - Heartbeat For Yesterday

December 12, 1972

Dr. Welby, called by flying physician Jerome Billings, an orthopedic surgeon, for help finds young Carlos in a diabetic coma. Carlos' grandfather, Charlie, convinced his grandson will die, objects to Welby's treating him but accompanies Carlos when Welby insists on flying the ailing youth to a hospital. Weather forces the plane into an emergency landing in which Charlie is injured, giving Welby two emergencies to handle.

4x14 - Dinner of Herbs

December 19, 1972

4x15 - A More Exciting Case

January 2, 1973

4x17 - Who Are You Arthur Kolinski?

January 16, 1973

4x18 - Gemini Descending

January 23, 1973

4x19 - The Problem With Charlie

January 30, 1973

4x20 - Catch A Ring That Isn't There

February 6, 1973

When 17-year-old gymnastic champion Rickie Manning falls off the rings in gym, he is examined by Dr. Kiley who suspects the boy has been drinking. He and Dr. Welby want the boy to get help from a group at Comeback House. Richie's parents resist at first, but come to face the fact they have helped create their son's problems by pressures on him following the death of their other son.

4x21 - The Working Heart

February 13, 1973

Laura Daniels develops a serious heart problem as the result of rheumatic fever. Although she accepts Dr. Welby's order to give up her TV interview show, she is convinced that her husband Paul loves her only as a successful career woman. She returns to work, getting pills from her assistant, Jan, and these, combined with liquor, cause her to collapse, making heart surgery mandatory.

4x22 - The Other Martin Loring

February 20, 1973

"The Other Martin Loring" is a 1973 episode of Marcus Welby, M.D., an American medical drama that aired on ABC. It tells the story of a middle-aged man facing several health issues, which seem to stem from his repression of his homosexuality. The episode aired on February 20, 1973, and was met with concern and protests from LGBT rights activists for its equating of homosexuality and illness.

4x23 - The Day After Forever

February 27, 1973

Troubled by his wife's relationship with a charming young political candidate, a successful architect-builder turns to tranquilizers and is seriously injured at a construction site.

4x24 - The Tortoise Dance

March 6, 1973