In the UK: Saturday, 6.15pm, 4th May 2013, BBC1/BBC1 HD. Available on the iPlayer
In the US: Saturday, 8pm/7c, 4th May 2013, BBC America
Not worth a full review, more a mini-review this, I think, since despite the presence of Diana Rigg (and daughter) in the cast, a reference to Tegan and a nice joke about Tom Tom (the sat nav, not the fourth Doctor), this was a pretty meh episode. It started off well enough, going for northern comedy and Victoriana, which are writer Mark Gatiss's real strengths. Rigg was good, everyone was acting fine, and despite being Doctor-and-Clara-lite, it was engrossing, right down to Murray Gold's Sherlock-riffs in the soundtrack.
But then it just sort of carried on, progressively becoming thinner, more predictable and less interesting as it tried to deport itself not as merely a comedy, but as a proper Doctor Who story, complete with evil, incredibly shit-looking beastie (we're talking Invisible Enemy shit, here). Not even an Avengers joke, more references to Clara's significance and a certain Sontaran getting to shoot people for a change could lift it from the "When's this going to end, again?" Which is a shame, because as a comedy, it would have been a really good episode, I reckon.
Oh well, it's Neil Gaiman doing Cybermen next week, albeit with the addition of a couple of kids to the companion line-up. Fingers crossed, it should be better.