Doctor Who: 10 Worst Things The Tenth Doctor Has Ever Done
6. The Runaway Bride - Racnoss Massacre
From one Christmas special to another, once again the Tenth Doctor goes too far.
The Runaway Bride sees the Tenth Doctor first united with Donna Noble in order to halt the plot of spider-like beings, the Racnoss. Throughout the episode, we learn there is a huge ship filled with the Queen of the Racnoss' children, trapped at the centre of the Earth when it was first formed.
When he returns to stop her, the Doctor informs the Queen he is a Time Lord, a once sworn enemy of the Racnoss. He tells her that he warned her, and as if he had no choice, releases explosive baubles which blows a hole in a tunnel, flooding the base beneath the Thames. The water pours in, and floods the base, wiping out the children, whilst the Queen escapes to then be blown up in her spaceship by a tank.
Casually the Tenth Doctor just stands there and watches. Only leaving by the prompt of Donna, which we later saw in Turn Left, were it not for her he would have stayed and died.
Once snapped out of it, Ten does seem shocked at what has has done, but no amends are made for this and the moment is never addressed again. Just casual massacring of Racnoss children...