"Featuring the 50th anniversary episode, this special collection is the definitive celebration of five decades of adventures through space and time with the Doctor and his companions. First broadcast in 1963, Doctor Who is the world's longest-running sci-fi show and is watched by an estimated 80 million viewers in 206 countries across the globe. Discover the rich history of the Time Lord in Doctor Who Revisited, enjoy the best of Murray Gold's musical score in Doctor Who at the Proms and see how the show began in the drama An Adventure in Space and Time, written by Mark Gatiss. Finally, Matt Smith and David Tennant co-star in the spectacular feature-length anniversary episode - The Day of the Doctor." -- iTunes Store
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Leading up the 50th Anniversary, revisit the Series 5 episode “Victory of the Daleks”, written by Mark Gatiss, and take a look behind-the-scenes, including a tour of Churchill’s war room and a WWII-era Spitfire. Special attention is paid to the new version of the Daleks faced by the Eleventh Doctor, who are bigger and more colourful than ever before.
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.