Do not read if you want to stay spoiler free.
Filming continues today on the Doctor Who series 8 finale episodes (11 and 12). The cast and crew have been out on the streets of Cardiff, meaning some of the shows guest stars and characters have been spotted by the public.
Last chance to disappear before the spoilers, either leave now or scroll down past the Captain Jack spoiler bomb picture...
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Joining the previously announced Michelle Gomez as the Gatekeeper of the Nethersphere will be Kate Stewart (Jemma Redgrave) and Osgood (Ingrid Oliver) from UNIT. Both last seen in The Day of the Doctor, although this time Osgood didn't have her Fourth Doctor scarf, instead she is sporting a nice Matt Smith style bow-tie, and Tenth Doctor red Converse shoes.
Oh yes, something else minor - the Cybermen will be returning in the episode too!!!
I would guess that the Cybermen will not be the only 'villain' in the episode, being as this shoot is so public. I suspect the actual big-bad will be shot on a closed set. But will that still be the Master???
Source: bbc.co.uk/doctorwho