4x1 - Tidal Waves

September 20, 1979

4x2 - Carlos, the Most Wanted Man in the World

September 27, 1979

4x3 - The Amityville Horror

October 4, 1979

4x4 - UFO Australia

October 11, 1979

4x5 - Immortal Sharks

October 18, 1979

4x6 - The Lost Colony of Roanoke

October 25, 1979

4x7 - The Shroud of Turin

November 8, 1979

4x8 - Mexican Pyramids

November 15, 1979

4x9 - The Abominable Snowman

November 22, 1979

4x10 - Pompeii

4x11 - D.B. Cooper

December 6, 1979

Follows the incredible hijacking commited by D.B. Cooper, who parachuted out of an airplane with the ransom money and was never seen again. It offers some evidence about Cooper's possible fate.

4x12 - The Ten Commandments (aka Mount Sinai)

December 13, 1979

4x13 - The Dark Star (aka The Dogons)

December 20, 1979

4x14 - The San Andreas Fault

December 27, 1979

4x15 - The Missing Heir

January 3, 1980

4x16 - Vincent Van Gogh

January 10, 1980

4x17 - Wild Children

January 17, 1980

Several alleged historical cases are examined of children who became lost and were raised in the wild by animals.

4x18 - The Ghost Ship (aka Mary Celeste)

January 24, 1980

4x19 - Earth Visitors

January 31, 1980

4x20 - John the Baptist

February 7, 1980

4x21 - Air Disaster Prediction

February 14, 1980

In this episode, In Search Of investigates the possibility of predictions of airplane disasters. Did an ordinary citizen predict the 1979 crash of American Airlines Flight 191 in Chicago? Did another citizen foresee the 1978 collision between a Pacific Southwest Airlines 727 and a small plane? Can such predictions be used to prevent other diasters?

4x22 - The Bimini Wall

February 21, 1980

4x23 - Glenn Miller

March 7, 1980