Another adventure for everyone's favourite time-traveller. Answering the Brigadier's space/time telegraph, the Doctor (Tom Baker), Sarah (Elisabeth Sladen) and Harry (Ian Marter) arrive in the village of Tulloch, near Loch Ness. A series of attacks have taken place on local oil rigs, and many are blaming the legendary monster. The Doctor discovers the creature to be the Skarasen - cyborg pet of invading aliens the Zygons. Their own planet having been destroyed and their spaceship crippled, these deadly shape-shifters are now intent upon taking control of the planet Earth.

An alien pod discovered in the Antarctic takes over one of the scientists who found it. The Doctor (Tom Baker) and Sarah arrive too late; the scientist has already become a Krynoid, a carnivorous alien plant life. Although they manage to destroy the first Krynoid, a second pod is obtained by plant fanaticist Harrison Chase, who intends to nurture the creature to his own ends. The Doctor calls in UNIT to stop Chase before the Krynoid grows and destroys all animal life on the Earth.

Another adventure for everyone's favourite Time Lord. Still chafing at his exile to the planet Earth, the Doctor (Jon Pertwee) is called in to observe the Inferno drilling experiment of Professor Stahlman (Olaf Pooley). Stahlman's search for a new form of energy goes horribly wrong when a green slime emitted from the drill site transforms any who come into contact with it into primeval monsters. Meanwhile, after experimenting with the TARDIS console, the Doctor finds himself transported sideways in time to a parallel version of the Earth, where the Brigadier (Nicholas Courtney) is an eyepatch-wearing fascist and Stahlman's experiments threaten to destroy the world.

A collection of previously lost, now restored episodes - known by fans as the 'orphaned' episodes - from the legendary Doctor Who series. Episodes are: 'The Crusade' (1); 'The Crusade' (3) - with commentary by Julian Glover and Gary Russell; 'The Daleks' Master Plan' (2) - with commentary by Peter Purves, Kevin Stoney and Ray Cusick; 'The Daleks' Master Plan' (5); 'The Daleks' Master Plan' (10); 'The Celestial Toymaker' (4); 'The Underwater Menace (3)'; 'The Moonbase' (2); 'The Moonbase' (4); 'The Faceless Ones' (1); 'The Faceless Ones' (3); 'The Evil of the Daleks (2) - with commentary by Deborah Watling and Gary Russell; 'The Abominable Snowmen' (2) - with commentary by Deborah Watling and Gary Russell; 'The Enemy of the World' (3); 'The Web of Fear' (1) - with commentary by Deborah Watling, Derrick Sherwin and Gary Russell; 'The Wheel in Space (3)'; 'The Wheel in Space (6) - with commentary by Derrick Sherwin and Tristan de Vere Cole; and 'The Space Pirates' (2). 'Audio only' episodes are: 'The Crusade' (2); 'The Crusade' (4); 'The Moonbase' (1); and 'The Moonbase' (3).