"Soviet Colonel Oleg Penkosky spied in the build-up to the gravest nuclear crisis of all time, when the world came close to annihilation.

"In 1960, Soviet Military Intelligence Officer Oleg Penkovsky passes a letter offering to share secrets with the U.S. Government to American students visiting Moscow, but Washington fails to respond.

Penkovsky later passes a letter to British Trade Delegation representative Greville Wynne warning that Soviet premier Nikita Khrushchev was planning an all-out nuclear attack.

Penkovsky meets with MI6 officer Harry Shergold and Central Intelligence Agency agent Joe Bulik a short time later on a trip to London and warns that the Soviets have been arming Cuba.

Penkovsky is instructed to gather info on missile strategy and is given British industrial secrets to help maintain his cover upon his return to Moscow.

KGB Lt-Gen Gribanov begins a surveillance sweep of Western embassy staff in Moscow, including Penkovsky's contact Janet Chisholm.

Penkovsky is arrested and confesses to Gribanov before signalling the Americans of an imminent Soviet attack in what Bulik suspects is an attempt to initiate a U.S. strike on Moscow.

"In 1944, Prof. Rudolf Peierls and his assistant Klaus Fuchs are summoned to Los Alamos National Laboratory to work on the Manhattan Project.

Fuchs was a German refugee who had joined the Communist Party of Germany in 1932 to oppose the rise of Adolf Hitler and was now a Soviet spy.

Cut off from his Soviet handlers Fuchs throws himself into his work until he is allowed to visit his sister, Kristel, in Cambridge, Massachusetts where he re-establishes contact.

"In 1950, Edward Teller briefs the team at Los Alamos National Laboratory about plans to construct a hydrogen bomb but U.S. Presidential Advisor Robert Oppenheimer opposes him.

Federal Bureau of Investigation agent Robert Lamphere gets Fuchs to confirm his contact was Harry Gold and this leads to the arrest of the Rosenbergs.

Hounam takes Vanunu to The Sunday Times in London, where Nuclear Physicist Frank Barnaby confirms the data, but the Mossad is tailing them.

France, Britain and the U.S. had been complicit in the construction under a secret agreement between U.S. President Richard Nixon and Israeli Prime Minister Golda Meir.

Israeli Prime Minister Shimon Peres forbids the Mossad from kidnapping Vanunu on British soil so they spring a honey trap to lure him to Rome.

The Western powers that had professed a stance of non-nuclear proliferation while collaborating in the construction of Dimona were exposed as hypocrites and yet the press in those countries remained curiously silent on the subject.

A joint CIA/MI6 task force uncovers Khan's dealings with Libya but are unable to move as Pakistani support is again needed in the post-9/11 Invasion of Afghanistan.