Tom Courtenay

Romy Schneider

Alan Badel

James Villiers

Leonard Rossiter

A petty crook finds himself mistaken for a murderer and a secret agent.

Sebastian must either deliver a young Arab prince to Russia or get him back safely to his own country.  The episode aired in the US in 1959, and in theaters in the UK in 1961 -- supporting the movie Wild in the Country with Elvis Prestley

During the Cold War, diplomatic courier Mike Kells must retrieve a dispatch containing top-secret intelligence. But when he arrives at the meeting point, a train station in Salzburg, his contact turns up dead, and the message is nowhere to be found. With no clear suspect in sight, Kells must sort through his uncertain relationships with two women, while sidestepping the pitfalls of subterfuge, sabotage and spies in his search for the documents.

Led by Kim Philby, Plan Aurora is a plan that breaches the top-secret Fourth Protocol and turns the fears that shaped it into a living nightmare. A crack Soviet agent, placed under cover in a quiet English country town, begins to assemble a nuclear bomb, whilst an MI5 agent attempts to prevent its detonation.

A local doctor is recruited as a cold war spy to fulfill a very important secret mission in the Middle East, only to experience that his mission is complicated by a sexy female double agent.

Two French agents fight a Chinese sect that aims to control the American Secretary of Defence via high-tech medicine, so that he would start a world war.

Foreign powers keep getting their hands on U.S. military secrets, so the head of the American diplomatic corps calls in his nephew Dick Stansbury to help. Stansbury knows that Doctor Montell is at the bottom of this, so he poses as an inventor of an innovative aerial gun. This sparks the doctor's interest, and when they both attend a weekend party at the Ryerson estate, Montell tries to get Stansbury to sell the gun to his country.

In Barcelona, secret agent Antoine Donadieu thwarts the plans of a Nazi scientist.

Eric O'Neill, a low-level surveillance expert with the FBI, believes he is accomplishing his dream of becoming a full-fledged agent, with his unexpected promotion and assignment to clerk for Robert Hanssen, a renowned senior agent with 25 years in the FBI. However, he soon learns the reason for his promotion is to gain Hanssen's trust and find proof that he is a traitor to the country. Determined to draw the suspected double-agent out of deep cover, O'Neill finds himself in a lethal game of spy vs. spy, where nothing is as it seems.