In the summer of 1940 Britain stood alone against Nazi Germany. Much of Europe had been defeated, and the triumphant Luftwaffe under its flamboyant leader Hermann Goering was poised to seize control of the air and allow an invasion of this Iast bastion of freedom. Only Royal Air Force Fighter Command stood in the way - and the Germans had no doubt that this could swiftly be annihilated. But this reserved and unassuming commander Hugh Dowding was determined that his massively outnumbered force could save his country. Action footage and specially-developed computer graphics combine to tell the story of a unique confrontation - the only battle which has ever been decided by air power alone.