Of course, it's an inevitability that following these types of preview screenings, dreaded 'spoilers' will begin to leak online. But is knowing a few tidbits about an upcoming episode really the same thing as having it spoiled? What's the difference between a teaser and a spoiler? Where should the line be drawn?
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When Digital Spy spoke to Who showrunner Steven Moffat back in May, he made it quite clear - not for the first time - that he'd rather an audience knew virtually nothing about an episode prior to watching it, saying: "A lot of the audience that I talk to specifically avoid any spoilers and I'm absolutely certain they have a better experience of the show."
But Moffat was also fully aware that there's a game of give-and-take involved in promoting a huge show like Doctor Who - a certain amount of information leaking out is necessary and simply unavoidable. "If I could make it on the dark side of the moon, I would," he added. "But you can't do these things.
"I got pilloried by somebody at some deep level of naivety about the industry - they were angry that I'd revealed the fact that Amy and Rory were even going to leave! But y'know, actors' agents really do have to advertise their clients' availability - I had no choice but to announce they were going to leave. But in an ideal world, you wouldn't even do that."
It's true - avoiding any and all plot points and character info for an upcoming Doctor Who episode would be a near-impossible task. Unless you're willing to cut yourself off from the internet, avoid listings magazines and urgently leap at the remote any time a new promo trail is screened, you're pretty much out of luck.
Most fans, then, accept that knowing a certain amount of information pre-broadcast is simply the way things go. For some, it can even be part of the fun - which brings us back to the murky issue of spoilers vs. teasers.
It's pretty clear what constitutes a major spoiler - in short, don't ruin the big surprises. Billie Piper's shock reappearance in 2008's 'Partners in Crime', David Tennant's surprise regeneration fake-out at the climax of the same year's 'The Stolen Earth' - these were massive plot twists best left unrevealed, the viewer clearly better off for not having been pre-warned.
But is the briefest of plot descriptions, the smallest of character hints, really the same thing? Some would argue it is - that any information revealed pre-broadcast can only damage the experience of watching an episode for the first time.
But these are arguably the hardcore - those who would watch every single episode of Doctor Who regardless - and as much as us fans would like to think it, not everyone is as dedicated as we are. Casual viewers need to be enticed, they need to be drawn away from laptops and games consoles and - most terrifying of all - the great British outdoors.
So sticking '...of the Daleks' in an episode title serves a clear purpose. So does revealing a brief character bio for a big-name guest stars. The show's panel at this year's Comic-Con is a perfect example. The Doctor Who team revealed enough to keep our interest piqued - attention-grabbing episode titles like 'Dinosaurs on a Spaceship' - without spoiling what is to come. Steven Moffat, his cast and his crew have become masters at saying a lot without actually saying anything at all - the art of the showman.
We can all agree that spoilers - proper, big, horrible spoilers - are a terrible, terrible thing. But more subtle reveals - a teaser here, a hint there - can actually improve the audience experience by adding to the anticipation. I'd go so far as to say that they're absolutely crucial to the continued success of Doctor Who.
What are your thoughts on spoilers? Should viewers go in blind or is a little info a good thing? Share your thoughts below!