Asylum of the Daleks presented viewers with a surprise as Jenna-Louise Coleman popped up playing the major role of Oswin during the episode! Preview attendees were asked to keep her appearance secret, and she sent a special message via the BBC: "Boo! Hello! Hope we gave you a good surprise! Thanks to all the fans who kept it quiet and made it so! More to come... watch this space!"
Steven Moffat also thanked everyone for maintaining the surprise: "I hope you all got a nice surprise when Jenna popped up in Doctor Who several months early. If so, that surprise came to you courtesy of the frankly magnificent ladies and gentlemen of the press, and of the many Doctor Who forums and blogs too. This show has been seen at four separate screenings, across four different countries and yet not one person gave one spoiler. From all of us on Doctor Who, a heartfelt thank you for helping us tell our story."
The photos are also available to download as wallpaper from the BBC website.