4x05: The Plastic Prison
4x04: The Sunspot Mystery
4x03: What Price Coal?
4x01: Hitler's Secret Weapon
3x19: The Genetic Chance
3x18: Inside the Shark
3x17: Death of a Disease
3x16: The Women Rebel
3x14: Hunters of the Seal
3x13: The Underground Movement
3x11: The Overworked Miracle
3x10: The Williamsburgh File
3x09: The Renewable Tree
3x07: Ninety Degrees Below
3x06: A Small Imperfection
3x05: A Desert Place
3x04: The Planets