Journey’s End ends Series 4 with a reality bomb, a second Doctor, a return to Bad Wolf Bay, and the cruellest fate the show has ever handed a companion.

The Stolen Earth takes the planet out of the sky, brings every companion back at once, reveals Davros, and ends on the show’s cruellest cliffhanger.

Turn Left changes one small decision in Donna’s life and watches Britain collapse without the Doctor, in the bleakest hour Doctor Who has ever produced.

Midnight traps the Doctor in a stranded shuttle with something that steals his voice, and lets a busload of frightened people become the real monster.

Forest of the Dead explains what saved means, gives Donna a whole life she never had, and asks River Song to die for a man who has never met her.

Silence in the Library strands the Doctor on a planet-sized library where the shadows eat people, and introduces a woman who knows him far too well.

The Unicorn and the Wasp drops the Doctor and Donna into a 1926 country house murder with Agatha Christie, a jewel thief, and a giant alien wasp.

The Doctor’s Daughter grows a child from the Doctor’s own hand, drops her into a war that isn’t what it seems, and sends Martha Jones home for good.

The Poison Sky ends the Sontaran two-parter with a choking Earth, a UNIT counter-attack that fails, and a spoilt genius finally doing one decent thing.

The Sontaran Stratagem brings Martha Jones back with UNIT, turns 400 million satnavs into a weapon, and unleashes the Sontarans on modern Earth.

Planet of the Ood finally explains why the Ood serve, and the answer is surgical. A blunt, angry anti-slavery story and the best use of Donna Noble yet.

The Fires of Pompeii strands the Doctor and Donna in Pompeii the day before Vesuvius, forcing an impossible choice and proving why he needs her with him.

Partners in Crime brings Donna Noble back as a full companion, with a diet pill that turns fat into waddling aliens and a shock cameo nobody saw coming.

Voyage of the Damned puts the Doctor aboard a doomed space cruise liner at Christmas, with killer angels, a corporate grudge, and a waitress named Astrid.

Last of the Time Lords ends Series 3 with a year of occupation, the truth about the Toclafane, the Master’s death, and Martha Jones finally choosing herself.

The Sound of Drums reveals Mister Saxon as the Master, newly elected Prime Minister, and pays off a season of hints with a truly nasty cliffhanger.

Utopia takes the Doctor, Martha and a returning Captain Jack to the end of the universe, where a kindly old professor keeps a fob watch he can’t explain.

Blink barely features the Doctor and is the best episode Doctor Who has ever made, introducing the Weeping Angels and a time paradox that fits perfectly.

The Family of Blood asks a human man to give up his own life so the Doctor can come back, then shows exactly why the Doctor was hiding in the …

Human Nature hides the Doctor inside a human schoolmaster in 1913, leaving Martha to guard a fob watch while scarecrows close in. Superb Doctor Who.

42 runs in real time as a cargo ship falls into a living sun, the crew burn from the inside, and the Doctor gets more frightened than we’ve seen him.