A museum exhibition of a mammoth comes to life at the opening of its exhibition and rampages around the museum. The Doctor and Amy turn up in New York just in time to have a nice pony ride on mammoth and then the mammoth is taken to a zoo, where the Doctor and Amy visit it and realise that whatever is inside doesn't like humans and have been trapped in their mammoth-like space ship for centuries and are now ready to take the people of New York to a mining project in far space, the Doctor is kidnapped and Amy and the finder of the mammoth have to rescue the Doctor from the Vykoids, the policemen is attacked by the vykoids and realises how strong they are. The Doctor lures Amy to him with mind communication and then Amy saves him and the Vykoid leader starts his teleportation of the American people just when the first people are about to walk to the mining project the Doctor and Amy turn up and trap the Vykoid leader in a pretsel doing so they defeat the Vykoids. The Doctor sends the Vykoids back to the mining project and dematerializes int the TARDIS. A pretzel seller watches as the TARDIS dematerialises and materializes, the Doctor comes out and gets 3 pretzels and tells the man that pretzels saved the day today. The Vykoid leader is in a spaceship and has only 2 words to say about how he got defeated: "Amy Pond."