Classic British sci-fi adventure starring Tom Baker. The TARDIS is drawn into the Mandragora Helix, an entity that transports the Doctor and Sarah to 15th century Italy.

Classic British sci-fi adventure starring Tom Baker. The Doctor tries to save Sarah from the Brethren of Demnos while Mandragora attempts to bring them both under its control.

Classic British sci-fi adventure starring Tom Baker. The Doctor saves a grateful Giuliano and then sets about rescuing Sarah, unaware that Hieronymous has hypnotised her to kill him.

Classic British sci-fi adventure starring Tom Baker. With Mandragora in complete control of the brethren, the Doctor must find a way to drain its energy on Earth before it's too late.

Classic British sci-fi adventure starring Tom Baker. A fiendish masterplan is set in motion when the President of the Time Lords is assassinated and the Doctor is set to take the blame.

Classic British sci-fi adventure starring Tom Baker. The Doctor is arrested on the charge of murdering the Time Lord President and must strive to prevent his immediate execution.

Classic British sci-fi adventure starring Tom Baker. The Doctor faces the assassin inside the matrix dreamscape while the Master tries to take out the Doctor in the real world.

Classic British sci-fi adventure starring Tom Baker. The Doctor discovers that the Master is plotting to tap into the Time Lords' power source, an act that will destroy Gallifrey.

Classic British sci-fi adventure starring Tom Baker. The TARDIS lands upon a mining ship run by a robot labour force overseen by a small human crew that has just suffered a fatality.

Classic British sci-fi adventure starring Tom Baker. As more of the crew are found strangled, Leela encounters an oddly inquisitive robot and the Doctor formulates a theory.