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[repeated line]
The Tenth Doctor: I'm sorry. I'm so sorry.
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[series 4 trailer]
Donna Noble: There are things waiting in the darkness. Creatures of metal, fire and blood. But he's out there, burning through time, facing a thousand dangers across the stars and never giving up. He looks like a man but he's a legend and his name is the Doctor. He'll come back to save us and this time I'm going to be ready. Then just like that...
Donna Noble, The Tenth Doctor: We'll be gone.
Philip John Bailey
Extended Reading