See the departure of the Doctor's long-term companion Sarah Jane Smith and the introduction of Leela. The season contains some of Tom Baker's most iconic serials, with intrepid investigations in Victorian London, deadly robots in a murderous whodunit, a return to the Doctor's home-world and one of the saddest goodbyes in Doctor Who history.

THE MASQUE OF MANDRAGORA: After an encounter with the deadly Mandragora Helix, the Doctor and Sarah Jane land in 15th Century San Martino. In the midst of danger, secrecy and intrigue, they witness the flowering of the Italian Renaissance. As the masque to celebrate the accession of the new Duke approaches, the Doctor realises that a third visitor has arrived with him in the TARDIS. It is a force with the power to wipe out human civilisation forever. The Doctor has brought it to Earth and only the Doctor can stop it...

THE HAND OF FEAR: After Sarah Jane becomes trapped under tons of rock in a quarry, she eventually emerges clutching a mysterious fossilized hand. What supernatural hold does this strange appendage have over her and what of the alien creature it becomes? THE DEADLY ASSASSIN: The Doctor arrives on Gallifrey where he is accused of assassinating the Time Lord President. This is part of a plot by his old adversary the Master, whose evil intentions go much further--he has a Doomsday Plan. It is up to the Doctor to prevent him from destroying Gallifrey and taking over the Universe! THE FACE OF EVIL: When the Tardis arrives on a jungle planet, the Doctor encounters two warring tribes, the Sevateem and the Tesh. The Sevateem worship a god called Xoanon and the Tesh are supposedly keeping Xoanon prisoner But why do the Sevateem call the Doctor the Evil One? And what are the invisible creatures in the jungle? The Time Lord, with the help of a girl called Leela, is about to find out. THE ROBOTS OF DEATH: On a distant, barren planet, Storm Mine 4 trawls across bleak deserts and through fierce dust-storms in search of rare and valuable metals. Onboard the Sandminer is a small skeleton crew, who alternate between indulgent relaxation and skilled mining work. The mundane, day-to-day duties of the mine are attended to by a much larger complement of servile robots. This is a society that is dependent on robots for all areas of life, the people comforted by the knowledge that the strictest safeguards are built into each and every robot's programming. So when one of the Sandminer crew is murdered, suspicion falls on two new arrivals... The Doctor and Leela arrive on board, and are immediately accused of being the suspects. But the Doctor deduces that the killer is possibly not human. More deaths occur - can he persuade the remaining crew members that the killer may be a robot? THE TALONS OF WENG-CHIANG: Women of Victorian London fall prey to an unknown menace, while monstrous terrors lurk in the sewers under the city. Chinese gangs scurry in the dank fog and a sinister stage magician seeks to serve his mysterious master. The Doctor and Leela arrive, only to find themselves plunged into a series of macabre horrors...