Waiting For Arthur

Merlin dies and was reborn in another time, not knowing a single thing about his past. He lives a thousand lives until one day, the Doctor finds him in despair for his parent's lost during the battle with Daleks in New Earth. He's waited for centuries without knowing that he had been waiting. Finally, with a little help from the TARDIS, Merlin (or Jethro) has found a way to regain his memory as Arthur rises once more.