Since “Let’s Kill Hitler,” Steven Moffat’s been playing around with what I believe he once referred to as “sexy” episode titles – phrases chosen to provoke instantaneous fannish excitement. “Dinosaurs on a Spaceship” from earlier this season was one. The upcoming season finale, “The Name of the Doctor,” is another obvious example. When the title “Journey to the Centre of the TARDIS” was unveiled last year, one can only imagine the myriad deafening sounds of squee that registered across the land. How big is the TARDIS, and what’s beyond the console room? The TARDIS is infinite, so even within the confines of an episode devoted to that exploration, it still feels like we’ve barely scratched the surface…but that doesn’t mean the production team didn’t do a pretty sweet job of making that scratch.
Steven Moffat said that the entire idea for the episode emerged from his feelings of childhood disappointment over the Tom Baker serial “The Invasion of Time,” which featured an extensive – albeit mostly unimpressive – journey through the TARDIS. To be fair to that serial and at the same time taking Moffat ever so slightly to task, it was the first time viewers saw the TARDIS swimming pool, so due credit must be given for that alone. That swimming pool was clearly important enough to Moffat’s imagination that he used it in “The Eleventh Hour” - in the very first moments of his era of Doctor Who, and it’s been referenced numerous times since, and it was shown once again here.
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