[5][6] Producer and voice director was Gary Russell who had previously directed the animated serials The Infinite Quest and Dreamland.

The Doctor and Amy arrive in Trafalgar Square, London in 1963 to find the city in ruins and under the control of the Daleks.

Following a woman, Sylvia, into the London Underground they learn that she is the only human survivor after the Daleks invaded – appearing through a 'split' in the sky.

The head of the operation, Professor Meadows (voiced by Sarah Douglas), tells them that all of her crew have been turned into Cyberslaves.

After the TARDIS steadies itself, Amy looks outside and sees the Doctor hovering, still conscious and surrounded by a number of strange blue worms, a short distance away.

The Doctor plans to take Amy to 23rd century London just after a 'Great Flood', but finds that the underwater city is being prowled by a gigantic shark-like creature.

The Doctor explains to Amy how sea levels rose dramatically, causing the entire human race to rebuild on higher land.

Before they are able to explain any more about the situation, the lights go out due to a generator malfunction; when they come back on, Martin's flesh has been eaten away from his skeleton inside his diving suit.

The Doctor and Amy travel through Poseidon's tunnels, while still being stalked by the Zaralok, in order to reach the generator and switch the lights back on.

After evading a pair of divers, now dead and re-animated by the Vashta Nerada, they succeed and head back to meet Oswald.

The Doctor believes the radiation is of alien origin and he knows how to create a cure to stop it; however, Oswald is reluctant to let him back out into the tunnels to find the required ingredients.

The Doctor convinces Dana to reopen the tunnels; she also gives away that the Zaralok, the Vashta Nerada and the radiation all seemed to appear after a flash of light a short distance away from Poseidon only a few days ago.

Jones' scanners pick up a shipwreck a short distance away; the Doctor identifies it as the USS Eldridge, a ship constructed by the USA during the WWII era.

After being there for centuries, the ship then jumped back through another wormhole and landed outside Poseidon, but the hole is still open and has allowed the creatures as well as the radiation to come through.

Jones helps the Doctor and Amy to get back to the TARDIS via a series of safety tunnels built beneath the main ones.

After they reach the controls which can close the wormhole, the Zaralok, which is apparently aware of their intentions, attacks the Eldridge, and begins to smash its way into the Accelerator.

Just before it reaches them, the Doctor finishes the process, and the Zaralok is dragged back through the wormhole along with the Vashta Nerada and the disease.

After the Doctor accidentally drops the sonic screwdriver into the rift and Rory recovers it, they trace the ship that they collided with and discover that it is under London in the seventeenth century.

With the Doctor now aware that they are dealing with a crashed Rutan ship underneath Parliament, he infiltrates the Gunpowder Plot to monitor their progress while Amy and Rory track down the ship, discovering a control room with a strange spherical device and a slot where a second one should be, but a child who followed them down there steals the sphere.

With Rory armed with a sound blaster that can disorient the Rutans, they manage to escape pursuit and find the weapons, which the Doctor realises are genetic bombs that could wipe out all of one race if activated.

In the end, the Doctor, Amy and Rory leave Guy Fawkes trapped with the barrels of gunpowder and return to the future to watch Bonfire Night fireworks.

On 17 June, Simon Nelson, controller of portfolio and multiplatform at BBC Vision told games magazine MCV that the number of downloads of the first episode had already exceeded half a million.

[33] To promote the second episode "Blood of the Cybermen", Steven Moffat and Nicholas Briggs went to Gavinburn Primary School in Scotland and to the Pacific Quay in Glasgow.

[34][35] To coincide with the airing of "The Big Bang" in the US on 24 July on BBC America and Space, the Windows versions of the first two episodes were made available to purchase outside the UK via Direct2Drive.

"[37] Despite an overwhelmingly positive reaction from fans,[37] the first episode of the series titled "City of The Daleks" received mixed reviews from critics.

Joe Keeley from Adventure Gamers gave the game 2.5/5 stars stating "Fans of the show are likely to get some kicks controlling the Doctor and Amy, but the gameplay is far too simple and repetitive to hold up as an enjoyable interactive experience.".