Location: Earth/Moon Date: 2008 Enemies: Judoon, Plasmavore, Slabs Trainee doctor Martha Jones has her hands full balancing her medical studies with placating her demanding family. So the last thing she needs is to find that the hospital where she works has been transported to the moon, where it's invaded by an overbearing alien police force. There she encounters a patient called John Smith, who seems curiously at ease with the situation…

Location: Earth Date: 1599 Enemies: Carrionites Martha takes her first trip in the Tardis, all the way back to Elizabethan England. She and the Doctor hear of a series of bizarre deaths and discover that playwright William Shakespeare is being controlled by dangerous witch-like creatures. It seems the time-travelling duo must defeat ancient forces to prevent history from being rewritten.

Location: New Earth Date: The year 5,000,000,053 Enemies: Macra The Doctor takes Martha to New Earth, in the far future, only to find that an entire city has become a deadly trap.

Location: New York Date: 1930s Enemies: Daleks (Cult of Skaro), Pig Slaves The Doctor investigates disappearances in New York at the height of the depression in the 1930s. Nefarious Pig Men linger in the sewers and the Daleks prepare an audacious plan at the top of the Empire State Building

Location: New York Date: 1930s Enemies: Daleks (Cult of Skaro), Pig Slaves The newly-created Dalek-human hybrid, and the other three members of the Cult of Skaro launch an attack on Hooverville, along with their Pig Slaves. The Doctor, Martha, and Frank manage to escape, but discover that the Daleks' plan involving the Empire State Building...

Location: London Date: 2008 Enemy: Professor Lazarus It looks as though Martha's odyssey is coming to an end when the Doctor drops her home, even landing the Tardis inside her lounge. But then a TV news report tickles the insatiable curiosity of our gallivanting Gallifreyan, and they're off again. So we're treated to the unusual sight of the Doc in a DJ as he escorts a glammed-up Martha to the launch of a scientific breakthrough: an eternal youth machine created by an elderly professor, Richard Lazarus. As with all weird science, the side effects are severe, but this is a very extreme case (and no, it's not suitable for tots). Doctor Who continues its game of spot the homage. Tonight's story is an enjoyable synthesis of She, The Fly and The Quatermass Experiment - even down to the final battle in a London cathedral. But despite some charming interplay between the two leads and an excellent turn from Mark Gatiss as the young and old professor, The Lazarus Experiment is a pretty conventional runaround, though the nightmarish Identikit creature is superbly realised and dedicated Whovians can look out for a "reverse the polarity" reference.

Location: SS Pentallian Date: The 42nd century Enemies: Ashton In a far-flung galaxy, saboteurs are at work, and crew members are being possessed. The TARDIS crew find themselves in the 42nd century on a spaceship, SS Pentallian, slowly being pulled into a sun, and must find a way to survive

Location: A boys' boarding school Date: 1913 Enemies: The Family of Blood England, 1913. A schoolteacher called John Smith dreams of adventures in time and space. The Doctor, along with Martha, heads to a boarding school, but what he finds is far from ordinary...

Location: A boys' boarding school Date: 1913 Enemies: The Family of Blood England, 1913. A schoolteacher called John Smith dreams of adventures in time and space. The Doctor, along with Martha, heads to a boarding school, but what he finds is far from ordinary... Conclusion.

Location: Hull, London, England Date: 2007 Enemies: The Weeping Angels Suggestion is a powerful weapon ... The Doctor is lost in time and within the walls of an old, abandoned house, murder is afoot and the Weeping Angels await... A young woman called Sally visits a dilapidated house, and is led down a terrifying time-torn path.

Location: Malcassairo Date: The Year 100 Trillion Enemies: Futurekind, The Master After being brought back to life in The Parting of the Ways, Captain Jack Harkness was just left on the Gamestation by the Doctor and Rose. In this episode, Captain Jack Harkness storms back into the Doctor's life, and the TARDIS is thrown to the end of the universe itself.

Location: London Date: 2008 Enemies: The Master, the Toclafane Harry Saxon becomes Prime Minister and his reign of terror begins – but that's only the start of his ambitions, as he announces mankind's first contact with an alien race, the Toclafane. An audacious plan spanning the whole of time and space begins to close around the Earth, in the penultimate episode of Russell T Davies's Doctor Who.

Location: Earth, The Valiant Date: 2008, 2009 Enemies: The Toclafane, The Master One year has passed since the events of "The Sound of Drums." The Earth has been conquered and its population enslaved, the Doctor is the Master's prisoner, and the warships of a new Time Lord Empire rise from the ashes. The fate of the world is in Martha Jones' hands.