The Moonbase

The Moonbase was one of the Cyber-Documents, a set of audio-visual documents originating from Earth, which were compiled into the CyberHive. Designated Document 5, The Moonbase was an account of the Cyberman attack on the Moonbase on Earth's Moon. (AUDIO: The Early Cybermen)

Behind the scenes
The Moonbase corresponds with the Doctor Who story of the same name.