Date Aired:
Apr 26, 2008 (United States), May 16, 2008 (United States)
Doctor Who S4E4
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The Doctor is called back to modern-day Earth by an old friend as an old enemy starts some new troubles. Aided by the Rattigan Academy, the Sontarans establish a covert base at the mysterious ATMOS Factory. The Doctor must stop the Sontarans from unleash