The BF team created some interesting and engaging characters for UNIT, and the third and fourth stories (in particular) are excellent. Nick Courtney reprises his role as the Brig with gusto, and the actors playing the leads (Cols Chaudhry, Dalton and Brimmicombe-Wood, and Lt Hoffman) are excellent. I just listened to the series for a second time last week and even though I knew what was going to happen, I was still gripped by the tension and drama!