As the Doctor Who 50th Anniversary Special and the Christmas Special loom on the horizon, a few spoilers have leaked out - including a first look at a new still featuring three different Doctors, as well as a clue to what may spark the 11th Doctor's regeneration.

Although Stephen Moffat and Co. like to keep their proceedings tightly under wraps, an intrepid visitor to the Edinburgh TV Festival managed to snap a quick photo during the screening of a 50th Anniversary clip.

"Just seen exclusive clip of #doctorwho featuring THREE doctors together, John Hurt, David Tennant and Matt Smith. #edtvfest," tweeted Simon Crossley of Zodiak Media.

Crossley then posted a photo of the scene, but it appears to have since been removed. Head over to Spoiler TV to catch a glimpse of the Tenth and Eleventh Doctors with their past counterpart.

While the hit BBC program prepares to mark a half-century since its inception, it is easy to forget that barley a month later Whovians will be faced with the departure of Matt Smith. As Peter Capaldi prepares to take over the iconic role, it appears that cybermen are also gathering in the wings.

"Great to be stunting again for Dr Who in the Christmas Special playing a Cyberman!" tweeted Darrelle Parker in newly deleted post, according to Spoiler TV.

Will the Eleventh Doctor meet his fate at the hands of one of his more notorious enemies? Or will the cyberman just be a minor part of the story.

The Doctor Who 50th Anniversary Special will air on Nov. 23.

Tags: Doctor Who