The Doctor and Martha go in search of a real live dodo, and are transported by the TARDIS to the mysterious Museum of the Last Ones. There, in the Earth section, they discover every extinct creature up to the present day, all still alive and in suspended animation. Preservation is the museum’s only job – collecting the last one of every endangered species from all over the universe. But exhibits are going missing...

Rose carefully dropped three pound coins into the large collecting box at the entrance to the British Museum. Her mum tutted. ‘What d’you want to go and do that for? You don’t have to pay.’ ‘It’s a donation,’ Rose pointed out. ‘They suggest you make one.’ Jackie raised disbelieving eyes towards the huge domed ceiling. ‘That’s only for people who haven’t been dragged here against their wills on a Sunday morning.’

Rose and the Doctor return to present-day Earth, and become intrigued by the latest craze – the video game Death to Mantodeans. Is it as harmless as it seems? And why are so many local people going on holiday and never returning? Meanwhile, on another world, an alien war is raging. The Quevvils need to find a new means of attacking the ruthless Mantodeans. Searching the galaxy for cunning, warlike but gullible allies, they find the ideal soldiers – on Earth.