Just listened to Big Finish's Doom Collation
Its 4 boxsets with 4 episodes on each, with 8.
It introduces the 11. The 11 is a really interesting concept, a timelord who suffers from a multiple personality disorder. Basically all his previous regenerations are trapped inside his mind trying to break out. The first episode really makes the concept scary but I found until the last boxsets last episode, the 11 became a bit of a pantomime villain and often in the sidelines which is a shame as I love the concept and think it could work great in the TV show.
Last year I'd listened to dark eyes which starts great and has a great master show up played by Alex mqueen. It did get a little convoluted by the end and found doom collation flowed far better.