The Killer
I don't know. I liked the movie, but I just couldn't get the motivation of the Doctor. Oh sure, he gets to be young again, but he doesn't seem to do anything with those extra years. He can't really keep running his clinic because people will notice that he looks pretty good for a 144-year old man.
In those extra years he bought himself, he seems to hide in his lair and do nothing but chat with his dead family. He didn't seem to try to perfect his elixir (each time it had the exact same effect) or interact with real humans.
Oh, and where did he get his super strength from? His elixir was for long life, not for super strength.
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"Music is a world within itself, with a language we all understand." - S. Wonder