Sezon 17
Bölümler
1 Poison in the Rockies 9 Oca 1990 2 Race for the Top 23 Oca 1990 3 Disguises of War 6 Şub 1990 4 The Bomb's Lethal Legacy 13 Şub 1990 5 The Big Spill 27 Şub 1990 6 The Genius That Was China: Rise of the Dragon 20 Mar 1990 7 The Genius That Was China: Empires in Collision 27 Mar 1990 8 The Genius that Was China: The Threat from Japan 3 Nis 1990 9 The Genius That Was China: Will the Dragon Rise Again? 10 Nis 1990 10 The KGB, The Computer and Me 2 Eki 1990 11 Neptune's Cold Fury 9 Eki 1990 12 To Boldly Go... 16 Eki 1990 13 Poisoned Winds of War 23 Eki 1990 14 The Blimp is Back! 30 Eki 1990 15 Earthquake! 6 Kas 1990 16 Killing Machines 13 Kas 1990 17 Can the Elephant Be Saved? 20 Kas 1990 18 We Know Where You Live 27 Kas 1990 19 In the Land of the Llamas 4 Ara 1990 20 What's Killing the Children? 18 Ara 1990