'Invasion of the Earthmen' by Terry Nation

When a fellow agent is killed on the grounds of a mysterious school called the Alpha Academy, Steed and Tara investigate. Posing as husband and wife, they uncover a scheme by the organisers of the academy to train future astronauts for the purpose of conquering outer space. But their cover is soon blown, and both Steed and Tara find themselves trapped inside a deadly tunnel full of their secret fears, while the academy members hunt them down...

Patrick Macnee (John Steed), Linda Thorson (Tara King), William Lucas (Brett), Christian Roberts (Huxton), Christopher Chittell (Bassin), Wendy Allnut (Sarah), George Roubicek (Grant), Lucy Fleming (Emily), Warren Clarke (Trump)

Directed by Don Sharp
Produced by John Bryce

TX:
UK: 14th January, 1969

Notes:
*Featuring John Steed and Tara King

*The tag scene: Steed and Tara practice Judo in his flat

*This is the only episode of the three produced by John Bryce to remain relatively intact; see ‘Invitation to a Killing’ and ‘The Great Great Britain Crime’