The Warrior

The Warrior was the name used by the fifth incarnation of the Doctor from an alternate universe where the Fourth Doctor fulfilled his mission of altering the creation of the Daleks. He was also referred to as "the Doctor that Was" by the Unified Skaroan Alliance. (AUDIO: Aftershocks)

Biography
In a version of history, Sarah Jane Smith successfully convinced the Fourth Doctor to go through with destroying the Daleks. After doing so, they and Harry Sullivan tried to escape Skaro with the Time Ring, but both Sarah and Harry were killed by a prototype Dalek, which also shot the Doctor. However, the Doctor was extracted by Narvin just before the blast could fully kill him. Still slowly dying, Narvin provided the Doctor with the last Elixir of Life of the now destroyed Sisterhood of Karn, triggering the Fourth Doctor's regeneration into the Warrior.

As the results of the Fourth Doctor's decision rippled through time, the Warrior entered the Time War. He sent two temporal bullets to kill the Sixth Doctor and Peri Brown, who had been deemed temporal "aberrations". (AUDIO: Dust Devil)

Personality
Like N-Space's War Doctor, the Warrior had abandoned the name "Doctor". (AUDIO: Aftershocks) He did not have any reservations to kill, and similarly to the Sixth Doctor he could be rather brusque when provoked. He carried a strong hatred against the Daleks. (AUDIO: Dust Devil, Aftershocks)

Appearance
The Warrior resembled N-Space's Sixth Doctor, but his attire resembled his N-Space counterpart's war incarnation. The Warrior wore a brown leather trenchcoat and a dark green-brown, double breasted moleskin waistcoat with 10 brass buttons and a fob chain attached to it. (AUDIO: Aftershocks) For neckwear, the Warrior wore a scarf knitted in a burgundy and ivory herringbone pattern. (AUDIO: The Difference Office)

Behind the scenes
As shown on the trailer of Genesis, the Warrior's TARDIS' interior resembled that of the Fifth, Sixth and Seventh Doctor's console rooms, but in disrepair and beginning to collapse in on itself.