|Edition: || UK (VHS)|
|Released: ||July 1993|
|Publisher: ||BBC Video|
|Format: ||2 x VHS PAL|
When UNIT begins its investigation into strange happenings at a secret atomic research center on Wenley Moor in Derbyshire, the Brigadier sends for the Doctor and Liz. With mysterious leakages in the power supplied by the nuclear generator, the stability of the reactor itself is under threat. A major atomic explosion is imminent. The Doctor suspects internal sabotage. Until an attack by a prehistoric monster while he is visiting the nearby caves leads him towards a more sinister conclusion. What is really lurking there in the shadowy depths? Who or what is controlling the monster? And to what end?
The Doctor must move quickly to arrest a devastating power, active once more after millions of years in hibernation...
Originally transmitted in colour 31 January — 14 March 1970, this seven part adventure starring Jon Pertwee was lost in its original form. Only a black and white version and an edited colour American NTSC standard version remained, until now when technology worthy of the Doctor himself has reconciled the two, synchronising them into one full colour version.
Due to the archive nature of the film, the sound and picture quality may vary occasionally — please do not adjust your set