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Ice Mummies: Frozen in Heaven (November 24, 1998)
Ice Mummies: Return of the Iceman (November 24, 1998)
Ice Mummies: Siberian Ice Maiden (November 24, 1998)
The Incredible Journey of the Butterflies (January 27, 2009)
Infinite Secrets (September 30, 2003)
In Search of Human Origins, Part I (June 3, 1997)
In Search of Human Origins, Part II (June 10, 1997)
In Search of Human Origins, Part III (June 17, 1997)
In Search of the First Language (March 18, 1997)
Island of the Spirits (November 2, 1999)
Is There Life on Mars? (December 30, 2008)