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GridlockStory Number: 181 (3.3)
Writer: Russell T Davies
Director: Richard Clark
Starring: David Tennant, Freema Agyeman, Anna Hope, Ardal O'Hanlon
No of Episodes: 1
First Broadcast: Sat 14 Apr 2007
Running Time: 44 minutes 58 seconds
Average Audience: 8.40 Million Average AI: 85
The Doctor takes Martha to New Earth, in the far future, only to find that an entire city has become a deadly trap.