War Doctor's regeneration
The War Doctor, who himself regenerated from the Eighth Doctor, (TV: The Night of the Doctor) met his regeneration into the Ninth Doctor within his TARDIS, having felt his body "wearing a bit thin" after working with his other incarnations to end the Last Great Time War by relocating Gallifrey to a pocket universe. (TV: The Day of the Doctor) This was the ninth regeneration of his first regeneration cycle; as the ninth incarnation generally did not identify as the Doctor, the so-called Eleventh Doctor was technically "number twelve". (TV: The Time of the Doctor)
However, many other accounts indicated the Eighth Doctor fought in the Time War (COMIC: The Forgotten, Don't Step on the Grass, PROSE: Museum Peace, Osskah, etc.) and subsequently regenerated directly into the Ninth Doctor. (COMIC: The Forgotten, PROSE: Have You Seen This Man?, Doctor Who and the Time War, etc.)
