Who showrunner Steven Moffat promised that Chibnall’s script will bring UNIT back with “a clever little twist”.
"When I was a kid, and just getting obsessed about the Doctor (still not recovered) it was the Jon Pertwee era, and UNIT was as big a part of the show as the TARDIS itself," said the writer.
"So when Chris asked if he could bring them back, I couldn’t say yes fast enough. And being Chris, he gave it a clever little twist which I know the fans are going to love.
Doctor Who continues this Saturday (September 22) on BBC One and BBC America.