Mark Seven

Mark Seven was an android member of the Space Security Service, a colleague of Jason Corey and Sara Kingdom.

In the late 40th century, Mark Seven travelled with fellow SSS members Jason Corey and Sara Kingdom on the Space Exploration Team mission to the surface of the giant meteorite M5. Within two days, the Exploration Team, which included Sara's brother David Kingdom, had established a pre-fabricated base called Explorer Base One, protected by a force field. They believed the meteorite devoid of intelligent life, but the base was attacked by Daleks while the SSS agents were searching the wider area. The only survivor from the crew was David, who was taken captive for interrogation. Discovering the Daleks' secret underground hideout, the SSS agents tried to rescue David and destroy the Daleks, but arrived too late to stop the Dalek ship escaping with their prisoner. (AUDIO: The Destroyers)

David Kingdom's fate is unknown. Mark Seven wrote a file about the incident, which Mavic Chen consulted when he and Bret Vyon met Sara Kingdom "so many years" later in 3999. (AUDIO: The Guardian of the Solar System)

Behind the scenes
The characters of SSS agents Sara Kingdom and "Agent Seven" had already appeared in The Dalek Outer Space Book published in September 1966. The version of Mark Seven seen in The Destroyers is a prototype of what actually got published first: the Mark Seven of the Anti-Dalek Force, featured in the 1970s Dalek annuals. Unlike the SSS Mark Seven, the ADF Mark Seven was far more "human". His human colleagues, Reb Shavron and Joel Shaw, had no idea he wasn't human.