So I'm listening to the "Worlds of Doctor Who" box set, which is basically just Big Finish linking some of their spin-off shows into a string of linked stories.
The first story starts off in the 1890's as an episode of
Jago & Litefoot (the theatre owner and pathologist that helped the Doctor and Leela in "The Talons of Weng-Chiang"-- Big Finish is like 7 seasons into their spin-off). It was a really good one, and the episode was surprisingly standalone. It all seems to conclude nice and tidy in the end, with one lingering plot thread that leaves the door open for the second story in the box set...
The second story is an episode of
Counter-Measures. This spin-off is about the scientists and military personnel that helped the Doctor and Ace in "Remembrance of the Daleks." Big Finish is about 3 seasons into their show about slightly more grounded pre-UNIT sci-fi investigations. Again, like the first story in the box set, it's a good example of an episode of that particular audio series, and it feels pretty standalone. It picks up on elements from Jago & Litefoot's adventure without making it required listening.
I'm just about to start the third episode in the set, which apparently takes place in the present day and follows Cap. Mike Yates alongside two American UNIT soldiers who were introduced in the Companion Chronicles: Cap. Ruth Matheson and Warrant Officer Charlie Saito. Ruth and Charlie are voiced by the two actors who played Grace and Chang in the 1996 TV movie. Big Finish doesn't wanna fork over the money to NBC/Universal to use those characters, so they made up two original UNIT characters for the actors to play. Ruth and Charlie are the two night guards of UNIT's "Museum of Terrors" (the Black Archive from "The Day of the Doctor").
I haven't listened to it yet, but the final story is supposed to feature the 2nd Romana, Leela, and the Sixth Doctor. Looking forward to that one.