Or Brand New Doctor or Hand New Day, however you want to see it.

Hand!Doctor (from Journey's End) sees what must be done about the Dalek menace. Crazy how an instantaneous biological metacrisis can clear things up like that.

Spoilers for 4x13 - Journey's End.

Song is Brand New Day from Dr. Horrible's Sing-along Blog, by Joss Whedon, Jed Whedon, Zack Whedon, and Maurissa Tancharoen.

Doctor Who belongs to the BBC.