4 - 1Hitler's Secret Weapon Jan. 05, 1977- 4 - 2The Hot Blooded Dinosaurs Jan. 12, 1977
- 4 - 3What Price Coal? Jan. 19, 1977
- 4 - 4The Sunspot Mystery Feb. 02, 1977
- 4 - 5The Plastic Prison Feb. 09, 1977
- 4 - 6Incident at Brown's Ferry Feb. 23, 1977
- 4 - 7Bye Bye Blackbird Mar. 02, 1977
- 4 - 8The Pill for the People Mar. 09, 1977
- 4 - 9The Gene Engineers Mar. 16, 1977
- 4 - 10The Human Animal Mar. 23, 1977
- 4 - 11The Wolf Equation Mar. 30, 1977
- 4 - 12The Dawn of the Solar Age Apr. 20, 1977
- 4 - 13The Business of Extinction Apr. 20, 1977
- 4 - 14The Red Planet Apr. 27, 1977
- 4 - 15Tongues of Men (1) May. 11, 1977
- 4 - 16Tongues of Men (2) May. 18, 1977
- 4 - 17Linus Pauling: Crusading Scientist Jun. 01, 1977
- 4 - 18Across the Silent Barrier Jun. 22, 1977
- 4 - 19The New Healers Jun. 29, 1977
- 4 - 20The Green Machine Jan. 11, 1978
