"Since I am in the midst of my travels...I must bid you farewell. Shouldn't you be returning home as well? Whenever there is a meeting, a parting is sure to follow. However, that parting need not last forever... Whether a parting be forever or merely for a short time...that is up to you. With that, please excuse me..."
—The Happy Mask Salesman from The Legend of Zelda: Majora's Mask
"I have to go now. My planet needs me."
The narrative restoration always comes at a price. The Doctor can get out of anything, but the flip side is that he is always going to be alone. The Doctor's fundamental move - the first trick we ever saw him do - was to fall out of the world. To escape. But when you escape, you are, in the end, alone.
"After defeating the 'Planetforger', 'Sombress' and 'Kerykeion' bid farewell to those who remained. I donít know where they are headed to, but the fragments of power of the 'Planetforger' residing within them probably led them to watch over the Surface World somewhere out there."
Evilswarm Exciton Knight, Yu-Gi-Oh! Master Guide 4