Earth's greatest heroes, including Martha, Rose and Captain Jack assemble to form the Doctor's secret army in a bid to find him and help save the world from the Daleks. It's action all stations as they open a subwave network to try to call the Doctor who is somewhere deep in space. Great clip taken from the penultimate episode of series four of Doctor Who. Watch more high quality videos on the new BBC Worldwide YouTube channel here: http://www.youtube.com/bbcworldwide
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