No. of Episodes:

19

Starring :

Season 4

05/01/1977

Episodes

Hitler's Secret Weapon

The Hot Blooded Dinosaurs

What Price Coal?

The Sunspot Mystery

The Plastic Prison

Incident at Brown's Ferry

Bye Bye Blackbird

The Pill for the People

The Gene Engineers

The Human Animal

The Wolf Equation

The Dawn of the Solar Age

The Business of Extinction

The Red Planet

Tongues of Men (1)

Tongues of Men (2)

Linus Pauling: Crusading Scientist

Across the Silent Barrier

The New Healers