Probably the best Big Finish Doctor Who adventure,
This review is from: Sympathy for the Devil (Doctor Who: Unbound) (Audio CD)
I've just listened to this story for the fourth or fifth time which is unusual for a Big Finish play. I think the difference with this one is the casting. David Warner effortlessly slips into character as the Doctor. David Tennant plays the UNIT Colonel, Mark Gatiss is the Master and of course Nicholas Courtney as the Brigadier.
Although this is one of the 'alternative who-niverse' stories, Warner playing a third Doctor directly after the timelords forced regeneration of the Pat Troughton one, the story should appeal to casual fans as well as the more hardened variety.