“The Night of the Doctor,” secret webisode by Steven Moffat
The mini-episode starts chaotically, with a brown-haired British girl at the helm of a crashing spaceship. It takes us a couple seconds to realize that it is not Clara, the current companion to the Eleventh Doctor. Her name is Cass, and she is very brave and snarky even in the face of certain death, which makes her prime companion material. But we are getting ahead of ourselves.
A flash! Then a very familiar face appears on board.
At this point, all of Who-fandom raised their fists into the air, growling “MOFFAT! I love you, you sneaky bastard!” This webisode was a complete surprise, you see, and now we are getting the feeling that this is a direct prequel to the 50th Anniversary episode premiering in 9 days.