The comedy is set six weeks after the Gu'un aliens have invaded and completely conquered Earth. It "explores the culture clash between humankind and its new masters, who are trying to make sense of a planet so confusing and idiotic that its inhabitants can't even agree which side of the road to drive on."
Declan Baxter will star as Stewart, the Gu'un's official hapless human liaison who ends up saddled with alien Greggs (Joe Thomas, pictured) for a housemate. Stewart must help the Gu'uns deliver their message to the masses and win favour with humankind, while also aiding the human resistance and managing his enduring crush on Georgia May Foote's Elodie.
The two-hour show will also feature Vicki Pepperdine, Amanda Abbington, Mike Wozniak, Evelyn Mok, Bruce Mackinnon, Lucien Laviscount, Dane Baptiste, Rob Delaney, Ellie White and Miles Jupp, plus creators Laurence Rickard and Ben Willbond.