Doctor Who: 8 Reasons Donna Noble Saved The Doctor

This episode was one of two in Doctor Who's fourth series to receive a nomination for a Hugo Award. It is a phenomenal episode, featuring little of The Doctor and focusing instead on a 'what if?' scenario featuring Donna.

After a beetle, working for The Trickster, attaches itself to her back, an alternate reality is created wherein Donna never met The Doctor (resulting in his death in the flood that drowned the Racnoss). The episode is a dystopian retelling of what might have been, though Donna herself grows and grows throughout.

When Rose manages to convince her of the existence of the other reality, Donna puts everything on the line to go back in time and ensure that she turns left instead of right. In a dark twist, she discovers at the last moment that it is only her death that can make this happen.

Without hesitation, Donna steps in front of oncoming traffic. The resulting tailback ensures that past Donna makes the decision that would bring her to The Doctor and the TARDIS.

Time is set right again, and Donna manages to deliver Rose's fateful warning...