Rob, in his late thirties, who needs to decide if he wants to have a baby with his girlfriend Marta, but he’s worried that he’s fallen out of love with her. He asks his seemingly unhappily married friends for advice, who all tell him that he won’t be able to do better so he might as well marry her. But when Rob eventually does propose to Marta, things don’t go exactly to plan.
Judith, an uptight divorcee, is appalled when her daughter Lily quits law school to move into a commune of hippie-misfits who live according to the behavioural principles of the bonobo monkey, a species famous for its ‘make love not war’ philosophy.
Orbiting a quiet backwater planet, the massed forces of the universe’s deadliest species gather, drawn to a mysterious message that echoes out to the stars. And amongst them, the Doctor. Rescuing Clara from a family Christmas dinner, the Time Lord and his best friend must learn what this enigmatic signal means for his own fate and that of the universe.