Description: This unfinished story from the television series Doctor Who (1963) was released on video with linking material from Tom Baker. When a dangerous artifact goes missing from the study of retired Time Lord, Professor Chronotis, he calls on the help of the Doctor and Romana. Also looking for the artifact is Skagra, who is armed with a mind-draining sphere. The story revolves around the planet Shada, on which the Time Lords have constructed a high security prison for some of the Universe's most dangerous criminals. Unaired serial of the British science fiction television series Doctor Who. It was intended to be the final serial of the 197980 season (season 17), but was never completed due to strike action at the BBC during filming. In 1992, its recorded footage was released on video using linking narration by Tom Baker, who played the Doctor in the serial, to complete the story.