Companion Chronicles 6.01: Tales from the Vault (spoilers)

This is a really great story, creatively tying in mini-adventures with four companions together. In the extras for this or Mastermind Jonathan Morris said he didn't want to do this story of story again (and this is the guy who is Big Finish's resident time travel headache inducer!).

Another great aspect is the Vault itself. A plethora of potential story catalysts, with an incredible number of backstories as to how UNIT got a hold of them. How many were donated by the Doctor, or through incidents involving him? I can see a number of Short Trips with exactly this premise, and next year's Turn of the Screw may be just this. There's foreshadowing for Mastermind (the grandfather clock is mentioned, and the wax cylinder medium is used in Screaming Skull). It really is a shame we've only explored the Vault further a couple of time (Mastermind and The Screaming Skull). With the New Series license, the cloning vat from the Series 4 Sontaran two parter?