1 - 1From Pole to Pole Mar. 05, 2006
1 - 2Mountains Mar. 12, 2006
1 - 3Fresh Water Mar. 19, 2006
1 - 4Episode 4 May. 21, 2017
1 - 4Caves Mar. 26, 2006
1 - 5Deserts Apr. 02, 2006
1 - 6Ice Worlds Nov. 05, 2006
1 - 7Great Plains Jan. 01, 2017
1 - 8Jungles Nov. 19, 2006
1 - 9The Shallow Seas Nov. 26, 2006
1 - 10Seasonal Forests Dec. 03, 2006
1 - 11Ocean Deep Dec. 10, 2006