Another adventure for everyone's favourite Time Lord. The Doctor (Tom Baker), Sarah and Harry land on space station Nerva, where the chosen few of the human race are in suspended animation, awaiting the call to revive. However, an insectoid alien life form known as the Wirrn has infiltrated the Ark and cut through the humans' alarm clock. The Wirrn now intend to use the sleepers as the hosts for their hatchings and claim the Earth as their own.

The last adventure to star Jon Pertwee. To save the Universe, the Doctor must travel to the planet Metebelis Three, where he discovers an invasion plan of Earth by the Metebelis Spiders, under the leadership of the Great One. To save the planet the Doctor must absorb a lethal dose of radiation, triggering his third regeneration...

Two classic Doctor Who adventures set on the planet of Peladon, starring Jon Pertwee as the Third Doctor, with Katy Manning as his companion in the first story and Elisabeth Sladen in the second. In the four-parter 'The Curse of Peladon' (1972), the Doctor (Pertwee) finally seems to have escaped his exile to Earth when he manages to transport Jo (Manning) in the Tardis to the planet Peladon. The pair are mistaken for Earth delegates at a conference to decide whether Peladon should join the Galactic Federation, and discover that someone is attempting to use the legendary royal beast of Aggador to trigger off a war. In the six-parter 'The Monster of Peladon' (1974), the Tardis arrives on the Planet of Peladon half a century after the Doctor's first visit. The planet has now become of great tactical importance because of its focal position between warring factions. The Doctor and Sarah (Elisabeth Sladen) have to act as peacekeepers between rival ambassadors and they must also find the truth behind 'the spirit'.

Another adventure for the intrepid space/time traveller. The Doctor (Tom Baker) has returned the TARDIS to his home planet of Gallifrey, but why has he forbidden Leela (Louise Jameson) to accompany him? Why, upon claiming the Presidency, does he expel every senior Time Lord to the outer wastes? And what plan is he hatching with the hostile Vardans? The only people he seems to have taken into his confidence are K9 and Chancellor Borusa, but whatever game the Doctor is playing, he has reckoned without the return of an old foe... This story marks the departure from the series of Leela and K9 Mark 1.

More adventures with everyone's favourite time-traveller. In 'Full Circle', it soon becomes clear that all is not well when the Tardis scanner shows the Doctor (Tom Baker), Romana (Lalla Ward) and K9 an image of Gallifrey, only for them to discover an expanse of marshland when they venture outside the ship. The Doctor realizes that they have somehow travelled through a charged Vacuum Emboitment into E-Space where he meets the local Alzarians - themselves preparing to retreat to their damaged spacecraft, the Starliner, in an attempt to escape the lethal Mistfall. In 'State of Decay', when the Doctor, Romana and K9, still trapped in E-Space, land on a medieval planet, they do not realize that Adric has stowed away on the Tardis with them. They are soon in need of his help when they discover that the local society is ruled over by three vampire lords - Zargo (William Lindsay), Camilla (Rachel Davies), and Aukon (Emrys James). Finally, in 'Warrior's Gate', the Doctor may finally be on the verge of escaping E-Space when the Tardis is hijacked by Biroc (David Weston), a time-sensitive Tharil on the run from Captain Rorvik (Clifford Rose) and his crew of privateers. However, when K9 is damaged by the Time Winds, it becomes clear that he will not be able to make the return journey.

All four classic Doctor Who stories featuring the alien species, the Sontarans, who first appeared in the 1973 story, 'The Time Warrior'. The Sontarans are a self -cloning race who live in a militaristic society in the 'southern spiral arm of the galaxy'. Humanoid in appearance, with a squat build and distinctive dome-shaped heads, they are far stronger than mere humans and possess an unquenchable thirst for war. The other stories in this set are 'The Invasion of Time' (1977), 'The Two Doctors' (1984) and 'The Sontaran Experiment' (1975).

The Doctor (Tom Baker) and Sarah Jane return for a visit to Earth, only to discover that a wave of evil Mandragora energy has hitched a ride on the TARDIS and is now being used to plunge mankind back into the dark age. They have to thwart not only the murderous count, but also prevent the mad monk Heironymous and the Cult of Demnos from unleashing the Mandragora Helix on mankind.

The entire 16th season of the long-running cult classic. Tom Baker, the popular fourth Doctor, is joined by the beautiful Romana (Mary Tamm) in this 26-episode intergalactic treasure hunt for the all-powerful Key to Time. Includes six storylines: 'The Ribos Operation', 'The Pirate Planet', 'The Stones of Blood', 'The Androids of Tara', 'The Power of Kroll' and 'The Armageddon Factor'.

The Doctor (Tom Baker) and Sarah (Elisabeth Sladen) arrive on storm ridden planet Karn, where mad scientist Dr Solon (Philip Madoc) is creating a hybrid monster body for the brain of renegade Time Lord Morbius (voice of Michael Spice). Also on the planet are the Sisterhood of the Flame, who believe that the Doctor has been sent by the Time Lords to steal their Elixir of life. The Doctor must convince the Sisters of his good intentions and prevent Solon from returning Morbius to life.