The Doctor, Susan, Ian and Barbara land on the planet Hydra, where Admiral Jonas Kaan leads a vast flotilla of ships trying to elude the vicious race that has invaded and occupied their world. But his ships are being picked off one by one, vessels and crews dragged underwater by an unseen foe. The time travellers find themselves pitched into battle against the Voord, the ruthless enemy they last encountered on the planet Marinus.

The universe stands on the brink of a dimensional crisis - and the Doctor and Raine are pulled into the very epicentre of it. Meanwhile, on Earth, UNIT scientific advisor Dr Elizabeth Klein and an incarnation of the Doctor she's never encountered before are tested to the limit by a series of bizarre, alien invasions. At the heart of it all is a terrible secret, almost as old as the Time Lords themselves.

After the mysterious events at Coal Hill School, the British government has created the Counter-Measures group, a specialist team that investigates strange phenomena and dangerous technology. Their first missions will involve a haunted warehouse, a groundbreaking artificial intelligence, a mysterious new town and a threat to the future of the country.... Four full-cast audio dramas plus a behind- the-scenes documentary.

The British government has created the Counter-Measures group, a specialist team that investigates strange phenomena and dangerous technology. This box set contains four of their adventures plus a behind-the-scenes documentary.

Tracking a nexus point in time, the Doctor meets Dr. Evelyn Smythe, a history lecturer whose own history seems to be rapidly vanishing. The Doctor must travel back to Tudor times to stabilise the nexus and save Evelyn's life. But there he meets the Queen of England and uses all his skills of diplomacy to avoid ending up on the headman's block.... Written by: Jacqueline Rayner. Directed by: Gary Russell.

'Farewell, Great Macedon': The TARDIS materialises in the Hanging Gardens of Babylon, one of the Seven Ancient Wonders of the World, in the year 323 BC. The Doctor, Ian, Barbara and Susan meet Alexander the Great - but their excitement is tempered by the realization that these are the final days of Alexander's life. As the travellers become embroiled in the tragic events, the inevitability of history unfolds around them. But can they - and should they - change it?

The Doctor and Romana are enjoying a leisurely lifestyle as the Lord and Lady of a London townhouse. But trouble never stays away from them for long, and before they know it a chance discovery of alien technology leads them deep into the heart of the English countryside, where a malign presence lurks. As the Doctor dodges deadly butlers and ferocious gamekeepers, Romana is faced with a malevolent aunt and an even deadlier peril - marriage. Directed by Ken Bentley.

England, 1400. Winter. Blood in the snow. Henry IV has usurped the throne, and deposed King Richard II languishes in Pomfret Castle. Meanwhile the Doctor and his companions preside over New Year revels at Sonning Palace. But Sonning is a prison, treachery is in the air and murderous Archbishop Thomas Arundel will stop at nothing to crush the rebellion. As the Doctor and Barbara take the road to Canterbury, Vicki finds a royal friend, and Ian is dragged into a web of conspiracy at whose heart sits Geoffrey Chaucer.

'Prison in Space' by Dick Sharples, adapted by Simon Guerrier: A relaxing break for the Doctor and his companions Jamie and Zoe becomes something decidedly more sinister when they are arrested for trespassing. But what has happened to the planet Earth? And how has the malevolent Chairman Babs gained control? As the Doctor and Jamie are incarcerated in a prison that they can never escape from, Zoe is forced to change sides....

The Final Problem by Sir Arthur Conan Doyle. Adapted by Nicholas Briggs. Sherlock Holmes visits his good friend, Dr. John Watson...but Holmes is not his usual composed and supremely confident self. He is a hunted man. Having unearthed the criminal mastermind behind the greatest crimes in the land, Holmes has found himself a fugitive. But the great detective already has a plan in motion. It will not be long before his arch foe, Professor Moriarty, is in custody.

When the Doctor and Donna visit London's Technology Museum for a glimpse into the future, things don't go to plan. The most brilliant IT brain in the country can't use her computer. More worrying, the exhibits are attacking the visitors, while outside, people seem to be losing control of the technology that runs their lives. Is it all down to simple human stupidity, or is something more sinister going on?

The spaceship Starfinder is taking two dangerous criminals for trial on Earth. En route they crash through a meteor storm and have to make an emergency landing on Skaro - the planet of the dreaded Daleks. But Captain Redway and his faithful crew don't anticipate any trouble. After all, the Daleks were defeated 50 years ago, and now they are completely inactive. But when a crate full of mysterious devices is discovered and the Daleks start to come back to life, it becomes clear that there is a traitor amongst the Starfinder's crew....

October 1944: as World War II draws towards its conclusion, a Nazi defeat begins to seem almost inevitable. But that might be about to change.... Two intruders are captured in the grounds of Colditz Castle, the most secure POW camp in Germany. At first the guards think they're dealing with British spies. But the strangers arrived in an advanced travelling machine, the likes of which they've never seen before. With this Tardis in their hands, the Third Reich might triumph after all.

The Tardis materialises on the USS Eldridge after the Philadelphia Experiment has gone disastrously wrong. Most of the crew are dead, the ship is disintegrating and the Doctor soon realizes that the problem comes from another dimension.... As they attempt to find a way to get the ship home, the Doctor and Peri visit the distant planet Capron and meet its tyrannical ruler, Osloo. But the search for a possible solution only creates increasingly dire problems. Osloo's horizons have been widened - and space and time are hers for the taking....

The first time the fearsome Kraals attempted to take over the Earth, with the help of their android agents, things didn't go quite according to plan - thanks to the time-travelling alien Doctor and his allies at UNIT. This time Marshal Grinmal and his belligerent cohorts are ready for them. This time they'll make no mistakes. This time Chief Scientist Tyngworg has not just one plan but a backup plan and a backup backup plan worked out.