[AU 1/2]: The Doctor uses the Chameleon Arch in the hopes that it will take him to Rose, as it can bypass different universes (let's pretend it can). He doesn't care if he's human or if he doesn't remember her, he just wants to be with his Rose again.
This is set before Rose gets a TenToo.
Q: thoughts on the Female Doctor?
A: I don't really know. but I'm intrigued as to how it will go.