S7 E1: The Elusive Illness

S7 E2: A is for Atom, B is for Bomb

S7 E3: Living Machines

S7 E4: Portrait of a Killer

S7 E5: Umealit: The Whale Hunters

S7 E6: The Safety Factor

S7 E7: A Mediterranean Prospect

S7 E8: Mr. Ludwig's Tropical Dreamland

S7 E9: The Pinks and the Blues

S7 E10: The Cancer Detectives of Lin Xian

S7 E11: The Sea Behind the Dunes

S7 E12: Do We Really Need the Rockes?

S7 E13: The Big IF

S7 E14: Voyager: Jupiter & Beyond

S7 E15: The Wizard Who Spat on the Floor

S7 E16: The Water Crisis

S7 E17: Moving Still

S7 E18: A Touch of Sensitivity

S7 E19: The Red Deer of Rhum

S7 E20: It's About Time