Dragonsfield (lost Avengers episode)

DRagonsfielD  is a lost  Avengers episode, ftom the first season. It's the only episode not to features the character of Dr. Keel, because lan Hendry was filming another show, as allowed by his contract, at the time.

Synopsis
Steed arrives at Dragonsfield, a newly built training center for aastronauts that was built on the foundation of the old Dragonsfield manor house, to find a saboteur who has already succeeded in killing a member of the international team of scientist who run the place and are preparing for the launch of a manned orbital spy platform by testing the spacesuits developed for the mission. Steed and Security Chief Saunders decide to havd Steed undergo a test in which he's strapped to a chair and put under an air pressure equivalent to what he'd experience during launch - only to pass out due to the saboteur's efforts earlier. After being revived, Steed and Saunders track down the saboteur 's handlers and learn her identity - Dr Susan Summers, whom they are able to stop from killing her colleagues, Dr. Lisa Strauss. It turns out her mission was to prevent the platform being launched, because her home country already had such a platform in orbit and didn't want another one to be launched.