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A mysterious phenomenon renders the inhabitants of a small English town unconscious. When the town awakes, every woman of child-bearing age has suddenly and inexplicably fallen pregnant.

Gifted child psychotherapist Dr Susannah Zellaby (Keeley Hawes) helps support those affected. But her own daughter Cassie (Synnøve Karlsen) is among them, and Susannah can’t help but feel grave concerns over what can be behind this phenomenon.

Local officer DCI Paul Haynes (Max Beesley) is tasked with maintaining order but unbeknownst to them all, a terrifying force is building in Midwich. These children – potential parasites – flourish under the very love and care that their families give them. But who are these children? And what do they want?