"Join the Doctor, the Ponds and numerous friends on their latest escapades through space and time where they puzzle an unexpected invasion of Earth, save a spaceship full of dinosaurs, don Stetsons in a Wild Wild West adventure, and are even kidnapped by the Doctor's oldest foe. The explosive season concludes with Amy and Rory's heart-breaking farewell - a race against time through the streets of Manhattan. Will the Doctor really lose the Ponds forever? - there's only one way to find out..." -- iTunes Store
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Kidnapped by his oldest foe, the Doctor is forced on an impossible mission - to a place even the Daleks are too terrified to enter...the Asylum. A planetary prison confining the most terrifying and insane of their kind, the Doctor and the Ponds must find an escape route. But with Amy and Rory’s relationship in meltdown, and an army of mad Daleks closing in, it is up to the Doctor to save their lives, as well as the Ponds' marriage.
the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.