The Doctor visits his old Time Lord friend Chronotis in Cambridge, 1979. But the ruthless Skagra has also arrived to retrieve a book that will help unlock one of the Time Lords' greatest secrets: what is Shada? Filming for this story was never finished, and in this version the unfilmed material is completed via animation.
The story revolves around the lost planet Shada, on which the Time Lords built a prison for defeated would-be conquerors of the universe. Skagra, one such inmate, needs the help of one of the prison's inmates. He finds nobody knows where Shada is anymore except one aged Time Lord who has retired to Earth, where he is a professor at St. Cedd's College, Cambridge. Luckily for the universe, Skagra's attempt to force the information out of Professor Chronotis coincides with a visit by the professor's old friend, the Doctor. (Filming for this story was never finished, and in this version the story is completed via on-camera narration.)
Finalizada la Guerra de Secesión, un hombre negro, vestido con el uniforme del ejército unionista, vuelve al rancho de su anterior amo, quien lo hace copropietario de sus tierras. Este hecho provoca la reacción de algunos vecinos racistas y fanáticos, cuyas ideas radicales acerca de la esclavitud y la diferencia de clases fundadas en el color de la piel, siguen muy arraigadas.
