I loves me the time travel, is the thing.

It’s not the reason I originally got into Doctor Who – at least, I don’t think so. At the tender age I was when a Dalek chased Sylvester McCoy up some stairs, I wasn’t yet as hung up on the notion of time travel fiction as I’d later become. But the story possibilities offered by a central character that can hop around time are almost certainly among the reasons I’ve stuck around all these years. And it’s not something that I’m necessarily sure that RTD – for all the strengths of his run – shared. It’s true that the words that persuaded Rose to join the Doctor in the TARDIS were “It also travels in time”, but for Russell, the time travel was still more about the places (just places in the past and future) that could be visited. But considering that a number of my favourite films have words like “Back”, “Future”, “Bill” and “Ted” in their titles, it’s clear that what I like about a time travel story is the chance to play with the sequential – to wit, the sort of story in which a single changed event can create an alternate timeline, or the sort in which a character can influence their own present by pledging to use time travel to set up the past retrospectively.

And it’s clear from “The Big Bang” that Moffat – who’s always enjoyed playing with narrative order in shows that didn’t hand him the keys to a time machine – is a bit of a fan of that sort of thing as well.