This is the third episode in a seven-part PBS series that provides viewers with an overview of the theory of evolution: how the theory was conceived, how it has broadly influenced science, how it is commonly misunderstood, and how the theory effects everyday life. Written and directed by Kate Churchill and Richard Hutton, this installment of the documentary discusses the function of extinction in the process of evolution. The theory is that extinction makes room for new species. Also covered are the theories regarding the five mass extinctions the world has experienced, and theories as to whether or not humans may cause a sixth. Narrated by acclaimed actor Liam Neeson, highlights include animation sequences illustrating evolution, interviews with various scientists, and archival footage from a variety of sources, including American Museum of Natural History, BBC Worldwide Americas, Inc., Energy Film Library, Moana Productions, the National Archives, and the National Geographic Film Library. Included among the distinguished advisors for the series are Jane Goodall, Sharon Emerson of the University of Utah, author Stephen Jay Gould, and scientist William H. Calvin of Washington University. The series was originally televised September 24-27, 2001. ~ Steve Blackburn, Rovi