Attempting to return to UNIT HQ, the Doctor (Tom Baker) and Sarah land in England in 1911, where an ancient force is preparing to return and wreak destruction on the Universe. Sutekh the Destroyer, last of the Osirans, is planning to free himself from his prison on Mars. His robot Mummies are building a rocket to destroy the device which holds him prisoner and If he isn't stopped, there is not a force in the Universe which can stand against him.

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.

Another adventure for the intrepid time traveller. The Doctor (Tom Baker) and Romana (Lalla Ward) are holidaying in Paris when they stumble across the mysterious Count Scarlioni (Julian Glover) to steal the Mona Lisa. With the aid of inept detective Duggan (Tom Chadbon) they discover that the Count already has several Mona Lisas walled up in his cellar - all of them painted by Leonardo Da Vinci - and when the Doctor finds out that Scarlioni is also conducting time experiments he begins to realize that his latest foe is not all that he seems... Due in part to an independent television strike, this story achieved the series' highest ever viewing figures, with the final episode peaking at 16.1 million.

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.

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.

The newly regenerated Doctor (Tom Baker), assisted by Sarah, Harry and the Brigadier, has to track down the theft of the components for a powerful new laser gun, and the death of a prominent politician. Sarah investigates the mysterious Think Tank, where it becomes clear that robot K-1 is being misused by its political extremist masters and the Doctor has to prevent the robot from being used to start an atomic war. Tom Baker's first story as the Doctor.

The TARDIS materialises in an English quarry where Sarah is involved in a rock fall. When she is rescued, she is clutching a stone hand, which takes control of her and forces her to take it into the core of a nuclear reactor. The Doctor (Tom Baker) arrives too late to stop the hand from regenerating into an alien lifeform known as Eldrad, who demands to be returned to her home planet of Kastria. The Doctor obliges, but all is not as it seems with Eldrad. This was Sarh Jane Smith's last adventure with the Doctor, although she later returned in 'K-9 and Company', 'The Five Doctors' and 'Downtime'.

Another adventure for Gallifrey's favourite son. The Doctor (Tom Baker) is captured by the tribe of the Sevateem after landing on a strange alien world. He is befriended by Leela (Louise Jameson), a savage young warrior who tells him that her people recognise and fear him as the Evil One. Intrigued, the Doctor discovers that his own face is carved on a local rock face, reputed to be the home of the god Xoanon. Is the Doctor in some way responsible for Xoanon's presence, and can he prevent tribal warfare from breaking out? Also included is Louise Jameson's appearance on 'Swap Shop' to publicise her debut as Leela.

Two classic Doctor Who adventures, one from the 1970s and one from the 1980s, both featuring those sinister humanoids the Cybermen. In 'Revenge of the Cybermen' (1975), the Doctor (Tom Baker), Sarah Jane (Elisabeth Sladen) and Harry (Ian Marter) return to the space station Nerva (from 'The Ark in Space') to recover the TARDIS. They discover the crew decimated by a strange plague, to which Sarah falls prey. The Doctor realises that the plague is part of a plot by the Cybermen to destroy Voga, the planet of gold - gold being the only thing which is lethal to them. At the same time the Vogans are planning to destroy the Cybermen with their Skystriker rocket. The three-part adventure 'Silver Nemesis' (1988) was made to celebrate Dr Who's 25th anniversary. A statue, blasted into space 350 years ago, crashes into Earth in the core of a meteor. The Doctor (Baker) and his assistant Ace (Sophie Aldred) must fight two armies from different time periods, a regiment from 1988 and a battallion of soldiers from 2688, whilst guarding the statue from the clutches of the Cybermen.

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.

The Doctor (Tom Baker) and the newly-regenerated Romana land on a strangely familiar planet and investigate the drilling that is going on there. The Daleks are searching for their creator, Davros (last seen in 'Genesis of the Daleks'), in the hope that he can assist them in their war with the Movellans. The Doctor has to reach the evil Kaled scientist before the Daleks, but just who can he trust?

Another adventure for everyone's favourite Time Lord. A may-day call to the Doctor (Tom Baker) and Sarah takes them to the outermost horizons of the Universe where they find a Morestran military expedition stranded on a remote planet. The Doctor has to battle an anti-matter monster, the unstable Morestran Commander Salamar, and scientist Professor Sorenson, who is transforming into a deadly Anti-man.

Another adventure for everyone's favourite Time Lord. The Doctor (Tom Baker) and Romana take a holiday on the planet Argolis, in the giant pleasure dome known as the Leisure Hive. Unbeknown to them, Pangol, the son of the Argolin leader Mena, is planning to provoke a war with their age-old enemies the Foamasi, using the Tachyon Recreation Generator to create an army of duplicates of himself.

Another adventure for everyone's favourite Time Lord. When the Doctor (Tom Baker) and Romana (Lalla Ward) land on Chloris, a planet suffering from a lack of metal and an over-abundance of lush plant life, they become caught up in a dangerous power struggle. The planet's last metal mine is controlled by Lady Adrasta (Myra Frances), and she is determined to increase her control by using the Doctor's scientific knowledge; but rebel bandits are gathering outside the gates, waiting for the chance to end her regime.

A double helping from the 'Doctor Who' archives. Never aired on television due to a strike in 1979, the uncompleted six-part adventure 'Shada' traces the chase to recover a powerful book, 'The Artifacts of Gallifrey', stolen from retired timelord Professor Chronotis (Denis Carey). Skagra (Christopher Neame) is the evil despot responsible for this foul jiggery-pokery. Original footage from this episode was used as the Fourth Doctor's involvement in 'The Five Doctors', before it was reassembled, with an older and portlier Tom Baker narrating the missing gaps. Also included is the BBC-produced documentary 'More Than Thirty Years in the Tardis', a compilation of clips spanning the first thirty years of the Doctor, including some previously unseen footage, plus interviews with the many stars, writers, producers and designers.

Another adventure for everyone's favourite time-traveller. The Doctor (Tom Baker), Romana and K9 find themselves suspected of being drug smugglers when they arrive on the Empress, a luxury liner. The Empress has become merged with another craft, the Hecate, after colliding during a hyperspace jump. Somebody on board the Empress is smuggling Vraxoin, a deadly addictive drug, and matters are complicated still further when the Mandrells, a race of monsters being transported from the planet Eden, are let loose on board the ship.

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.

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.