Describes the events of what scientists accept as the worst nuclear disaster in history, with emphasis on the environmental effects on the immediate area and the world.

1:23 a.m., April 26, 1986 -- In the Beginning -- Chernobyl's reactors -- It was just a test -- Fires, confusion, and chaos -- The first effects -- Government response -- The world finds out -- The aftermath -- The legacy -- Timeline -- Essential facts --Glossary.