Doctor Who: 15 Cool Details Peter Harness Just Revealed About The Zygon Invasion

9. The Tunnels From Flatline Were Reused Due To Budget Limitations

Doctor Who The Zygon Invasion Clara Flatline tunnel
BBC/Twitter: @mrpeterharness

Twenty minutes into The Zygon Invasion, Clara rides a lift and finds herself in a massive, sparsely-lit tunnel, which leads to an area packed with Zygon pods.

This tunnel is the same one that was used in Flatline, an episode from Capaldi's first series as the Doctor. Harness' original idea was for the Zygons to inhabit abandoned Tube stations, but this notion was scrapped due to budget limitations.

Harness also stated that the idea of using a lift to reach the tunnel was thought up by script editor David Davis. Team effort!

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Danny has been with WhatCulture for over ten years, and is currently Doctor Who Editor and WhoCulture Channel Manager, overseeing all of WhatCulture's Whoniverse coverage. In 2022, he took charge of WhoCulture and has grown it into the biggest Doctor Who channel on YouTube, and one of the biggest Doctor Who communities on the web full-stop. He has been writing and video editing since his early teens, and first got a taste for content creation after making his own Doctor Who trailers, off the back of a burning obsession with the Matt Smith era of the show. Like many his age, he first got into Doctor Who with the 2005 revival, but has since gone back and fallen in love with the classic years too. If you need someone to recite every Doctor Who episode in order, or to give you a random factoid about the making of Gridlock, Danny is the person to ask!