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Much as we love Joss Whedon’s Dr Horrible , the fact that the web musical runs to just 45 minutes limits how much you can say about it. Even so, this tie-in book isn’t as comprehensive as it could be. Sure, it comes with a shooting script, sheet music for every song and even a transcript of the DVD commentary (that may sound unnecessary, but then it was a musical number in itself), but in terms of new material, it’s pretty sparse.

A companion book should be crammed with star interviews, and everything you could ever want to know about the genesis, production and distribution of an opus. Instead we’re limited to glorified soundbites that tease without ever going into depth.

Ian Berriman has been working for SFX – the world's leading sci-fi, fantasy and horror magazine – since March 2002. He's also a regular writer for Electronic Sound. Other publications he's contributed to include Total Film, When Saturday Comes, Retro Pop, Horrorville, and What DVD. A life-long Doctor Who fan, he's also a supporter of Hull City, and live-tweets along to BBC Four's Top Of The Pops repeats from his @TOTPFacts account.