Big Finish have announced that the 2013 Christmas Special release (main range subscribers free bonus, available generally December 2014) will be Trial of the Valeyard. This will see a rematch between the Sixth Doctor and his nemesis the Valeyard! This only weeks after the Valeyard was mentioned in Name of the Doctor!
The synopsis from the Big Finish news item is:
This year’s subscriber special finds the Sixth Doctor back in the Time Lord trial rooms - but he’s not the one in the dock this time! This time his sinister alternate The Valeyard faces his fate in the subscriber special we could only call Doctor Who: Trial of the Valeyard!
Doctor Who: Trial of the Valeyard reunites Colin Baker’s Sixth Doctor (as seen on TV from 1984-1986) with Michael Jayston as the Valeyard and Linda Bellingham as the Inquisitor in a tense courtroom drama. The three were last seen sharing the screen in 1986’s epic fourteen-part tale Doctor Who: The Trial of a Time Lord. The tables are turned in this new story as the Valeyard is forced to face up to his evil deeds - how will the Doctor judge his alternate self?
