The Doctor, Donna and Martha return to Earth by teleporting into Luke Rattigan's mansion. He build his own atmospheric converter, igniting the atmosphere to clear the poison, but will it be enough to save the world from the coking gas the Sontaran's created? Watch this fantastic clip from BBC smash hit Doctor Who to find out! Watch more high quality videos on the new BBC Worldwide YouTube channel here: http://www.youtube.com/bbcworldwide
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