Tenth Doctor (Donna's World)

On 25 June 2007, Donna Noble turned right instead of left; this small change in affairs produced Donna's World - a world in which she never met the Doctor. Without Donna there to stop him, the Tenth Doctor died confronting the Empress of the Racnoss.

Death
When London came under attack from the Webstar of the Empress of the Racnoss on Christmas Eve 2007, the Doctor entered her lair beneath the Thames Flood Barrier. The Doctor blew up the base, flooding the whole thing. When UNIT soldiers discovered his body beneath the River Thames, Private Harris assumed that he hadn't made it out in time and that it "must have happened too fast for him to regenerate". His body was taken to a UNIT base, with his corpse dropping his sonic screwdriver as it was taken away.

Donna Noble watched as his body was put in the back of an ambulance. As Donna walked away, a woman - Rose Tyler - ran towards her. Upon learning that the Doctor was dead, Rose replied "I came so far".

Legacy
Donna sometimes had dreams of her alternate life with the Doctor. When pressed, she remembered being with him as he confronted the Empress of the Racnoss on Christmas Eve.

Rose informed her that, had the Doctor been alive, he would have stopped the Titanic, the Adipose and the ATMOS. (TV: Turn Left)