Peter Davison is writing and directing a special mini-episode featuring past incarnations of the Time Lord.
Listed as the The Five(ish) Doctors, the 15-minute comedy will debut on the BBC Red Button, after The Day of the Doctor, at 10pm on Saturday night. The synopsis reads, "Miss the classic Doctors? They're back in this celebratory special written and directed by Peter Davison."
It’s unconfirmed exactly who will be involved in the short but earlier this year Sean Pertwee (son of the third Doctor Jon Pertwee) did tweet – and subsequently delete – a casting call for a scene featuring Colin Baker, Sylvester McCoy, Paul McGann and Broadchurch actor Olivia Colman all playing themselves. It is highly likely to be linked.
As to what the comedy will concern, a picture (below) was taken in September of Davison and McCoy filming a scene in which they ‘protested’ their omission from the 50th anniversary special with banners that read “No Classics? No 50th!” and “Have a heart, Classic Doctors want a part!” Being the keen Sherlock Holmes's we are, we’d say that this is linked to the mini-episode too.