“We don't get aliens in Sheffield.” In a South Yorkshire city, Ryan Sinclair, Yasmin Khan and Graham O'Brien are about to have their lives changed forever, as a mysterious woman, unable to remember her own name, falls from the night sky. Can they believe a word she says? And can she help solve the strange events taking place across the city?

• Sydney Newman
• C. E. Webber
• Donald Wilson

• Jodie Whittaker
• Jacob Anderson
• Mandip Gill