This one was always going to be my favourite Once And Future release, as it features both my favourite Doctor (David Tennant) and favourite Master (Michelle Gomez). It does not disappoint. The pair have so much chemistry that it makes you wish that this Doctor and this Master had met on TV. Whether it's the Doctor's bafflement that Missy would turn a deserted planet into War Of The Worlds because she was bored, or the pair having to deny that they are a couple, they're an absolute delight together. It's interesting that Missy also got hit by a degeneration weapon. They seem to hint that it was a past Master who degenerated into Missy, rather than Sacha Dhawan's Time Lord, so I wonder which Master it was? Derek Jacobi's, perhaps?

The Paternoster Gang also work surprisingly well with the Tenth Doctor, especially Strax. His wish for a pony felt like a fun reference to the horse riding Sontaran in War Of The Sontarans.

The whole story is as though the Tenth Doctor has been plonked in the middle of a Twelfth Doctor Series 8 episode, particularly as it plays with the idea of a story the Doctor knows to be fictional turning out to be real (sort of), like with Robot Of Sherwood and Last Christmas. It's an entertaining mash-up that works remarkably well.