In 2008, Alan gifts Belinda a star certificate naming a star "Ms Belinda Chandra." Seventeen years later, on May 23, 2025, Belinda is abducted by robots claiming she’s Queen of Msbelindachandraone. The Doctor chases them but is diverted by a time fracture. On the planet, Belinda learns the robots want her to marry their leader, the AI Generator, to unite the world. The Doctor helps rebels fight back, revealing the robots are flawed and that the star certificate became their founding myth. Belinda is recaptured and discovers the AI Generator is Alan, who was taken years ago and merged with the robots. She triggers a time paradox using the certificate, shrinking Alan to microscopic size. Peace returns, but Earth has mysteriously vanished on May 24. The Doctor and Belinda set off to find out why.