Brand new factory sealed blu-ray is the second of five special episodes lensed for Doctor Who.

When a London bus travels through a worm-hole to an alien world, the Doctor must join forces with the mysterious, aristocratic Lady Christina to help the unfortunate passengers, and themselves, get back home. But the mysterious planet holds terrifying secrets, hidden in the sand. And time is running out, as the deadly swarm gets closer...

An extra on the disc is a behind-the-scenes featurette which runs as long as the episode itself.