Doctor Who's classic monsters the Zygons are to appear in the 50th anniversary episode.
The shape-shifting race debuted in 1975's 'Terror of the Zygons' opposite Tom Baker's Fourth Doctor and will return in November's celebratory special.
Showrunner Steven Moffat previously indicated that the anniversary episode will not just be a "fanfest".
"We can't make this all about looking backwards," said the showrunner. "It's actually got to be the start of a new story."
Doctor Who continues this Saturday (April 6) at 6.15pm on BBC One with new episode 'The Rings of Akhaten'.
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