Doctor Who. the last adventure. The sixth doctor :

"A very special story which at last provides a heroic exit for Colin Baker's much-loved Time Lord. Four hour-long episodes, connected by the presence of the Valeyard, the entity that exists between the Doctor's twelth and final incarnations."--Big Finish website.

Bibliographic Details
Corporate Author:	Big Finish Productions Ltd
Other Authors:	Briggs, Nicholas (Director), Baker, Colin, 1943- (Performer), Barnard, Simon (Radio producer), Morris, Paul (Fiction writer), Barnes, Alan, 1970-, Fitton, Matt
Format:	CD Audio Book
Language:	English
Published:	[Maidenhead, Berkshire, England] : Big Finish Productions, [2015]
Edition:	Special limited edition.
Subjects:	Doctor > (Fictitious character) > Drama. Time travel > Drama. Doctor > (Fictitious character) Time travel. Science fiction plays. Audiobooks. Drama.