10 Doctor Who Villains Who Ultimately Turned Good

10. Kazran Sardick

The Scrooge-esque villain of Matt Smith's first Christmas special, Kazran Sardick wasn't strong, he wasn't overly clever, and he didn't wield deadly laser beams or rockets or anything like that: he was simply a callous, bitter old man.

With Amy and Rory stuck onboard a crashing spaceship, the Doctor has a limited amount of time to save them both - as well as the other passengers. Fortunately, the solution to this deadly scenario is rather easy: Sardick has a machine that controls the clouds up above, which can clear the skies and allow the ship to land safely.

But unfortunately though, Sardick is... well... a bit of a dick. He refuses to help, and is perfectly okay with the thought of the ship crashing and everyone aboard it dying.

And so, the Doctor is forced to improvise. Getting all timey-wimey and meddling with Sardick's past, he manages to warm the old miser's heart by connecting him with the beautiful Abigail, and by the end of the episode, Sardick has been transformed.

The episode then ends with Abigail and Sardick laughing with joy as they fly a shark through the sky. Flying sharks! This is when Steven Moffat peaked, folks.