Another Doctor is back? But who?

A while back, I blogged about a rumor involving Peter Davison coming back to Doctor Who for the show's 50th Anniversary as the 5th Doctor. While there hasn't been news of that, another Doctor has returned to the show's 50th anniversary, but for one minisode only. "The Night of the Doctor" shows Paul McGann's incarnation of the Doctor in a new outfit and haircut trying to save somebody's life, costing his 8th incarnation in the process. This minisode is mostly to cut some loose ties to the 8th Doctor's story. In his one-off special, Paul McGann's 8th incarnation appeared for one show only, and when the show came back in 2005, we saw a new face for the Doctor, meaning there was no regeneration scene for Paul's Doctor! While it was his only televised appearance, save for this, McGann still went on to play the 8th Doctor in a series of audio specials by "Big Finish". (He even names his companions from the Big Finish serials, making his adventures officially canon! This special also sets the mood as to how John Hurt's incarnation of the Doctor, here called "The War Doctor", came to be.