Doctor Who season 13's “swarm” clue confuses fans

Really, this raises a lot of questions. Given that season 13 has been confirmed as one interconnected, serialised story it seems to be a given that “swarm” in some way relates to the series as a whole, and could end up being a major part of the arc. However, outside of any context it’s utterly baffling – not that this has stopped fans from trying to decode it.

And already they have one or two good ideas. Many fans were quick to notice that the tease shares a name with 1970s Doctor Who monster The Swarm, a parasitic creature that takes over hosts through their eyes and was embodied by a slightly ropey prawn-like beastie called The Nucleus of the Swarm.

The 1977 story it appeared in marked the debut of K-9, but despite this The Invisible Enemy isn’t remembered as an all-time classic (at least partially because of the creature design), so it seems like an odd choice for a major comeback. Still, it could be that Chibnall has decided to revamp what is at base a good idea (alien body snatchers!) and redeem the Swarm with a more modern story, which sees the Doctor unsure who to trust.

With all that said, though, it’s also entirely possible that this name doubling is a coincidence. Given the history of secrecy during Chibnall’s tenure in charge, it seems unlikely he’d just…blurt out the name of a monster that was a part of his big plans. (Picture the scene. “My one word tease? Voord!” Chibnall says).

• For the latest news and expert tips on getting the best deals this year, take a look at our Black Friday 2021 and Cyber Monday 2021 guides.

Perhaps instead, the swarm nod is that fans could look for something of the tone of those monsters in series 13 – a kind of paranoia and lack of trust, possibly evidenced by the Doctor (Jodie Whittaker) keeping things from Yaz (Mandip Gill) in the new teaser trailer.

Or, as some have pointed out, it could just be an incredibly oblique hint that makes no sense now. The Day of the Doctor’s one-word tease was “paintings,” and with hindsight that makes perfect sense. Ahead of time? We were trying to look into the past of the show for relevant art-based adventures. It could be that by delving into a world of space-prawns, we’re doing the exact same thing here.

Maybe Swarm is a character, maybe it’s a characteristic of the threats faced by the TARDIS team (swarming around them) or maybe it’s just the name of the Doctor’s new cat. Maybe it’s a super-group of insect-themed supervillains from across the Who years (The Vespiform, the Wirrn, Chantho and the Zarbi forming their version of the Sinister Six), or a new gadget welded to the TARDIS controls. It could be anything!

Maybe it’s even the hint of a River Song return (pouring one out for the fans hoping Alex Kingston was the “special surprise guest” of the panel, or trying to make the tease word “riveting” include “river”) – after all, didn’t the carnivorous Vashta Nerada shadows “swarm” in her very first episode back in 2008?

Frankly, we could theorise about this for days – and rest assured, behind-the-scenes we probably will – and we have to tip our digital hat to Chris Chibnall for giving the fans some meaty speculation to tear into as they wait the next few months to actually see what it’s all about.

I don’t know about you, but I’m already pretty riveted and inspired by this mystery. And I can't wait for the next swarm of fan theories…

Doctor Who returns to BBC One later this year. Want more? Check out our dedicated Sci-Fi page and our full TV Guide.