Apart from the odd audio drama, Torchwood is pretty much dead and buried at this point – but if you were listening carefully, you might have spotted a sneaky reference to the world of Captain Jack Harkness et al in this week’s episode of Doctor Who.

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In Face the Raven, it was revealed that graffiti artist Rigsy (Jovian Wade) had been enticed to a hidden street and drugged, losing his memory of the entire incident. The drug used to remove the memories? Retcon – also known as Compound B67 or the amnesia pill, and a favourite of Torchwood Three for mind-wiping anyone unlucky enough to stumble on their operations.

Interestingly, retconning also refers to the practice of TV shows, comic books and films (or anything with a narrative really) reinterpreting previous events to fit in with the latest version of the story – for example Peter Capaldi's Doctor choosing to have the same face as Roman patriarch Caecilius and bureaucrat John Frobisher – so it was already a bit of an in-joke when it was used in Torchwood. In-jokes within in-jokes!

Anyway, the fictional drug was used in several episodes of the spin-off to remove the memories of various people (including lead character Gwen Cooper in the series premiere), and was last seen in Torchwood’s final ten-part series Miracle Day back in 2010.

Whether it was to forget an evil alien, confess secret affairs or just keep the organisation out of the public eye, Retcon was a pretty major part of Torchwood, but until now had never appeared in an episode of Doctor Who – so how did it end up in the hands of Maisie Williams' Ashildr?

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Perhaps, as predicted by Peter Capaldi’s Doctor in The Woman Who Lived earlier this series, fellow immortal Captain Jack Harkness finally found his way round to Ashildr and she picked up a few of his tricks. Or maybe since the dissolution of Torchwood Retcon is simply more readily available to the public – who knows?

Whatever the truth, we’re just glad to see Doctor Who paying a fun little tribute to its spin-off. We were getting worried it might have forgotten...

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Doctor Who continues next Saturday at 8:05pm

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