Although set in rural Cumbria, filming took place in North Yorkshire with the village of Kettlewell providing the outdoor scenes.

The setting for The Jenner Clinic was the nearby Malham Tarn Field Studies Centre, a Grade II listed Georgian country house owned by the National Trust.

The story focuses upon Chad, a young half-boy, half-chimp, developed by scientists as part of a top secret government operation.

However, Chad becomes aggressive, strong and uncontrollable, with the inability to communicate on a human level, escaping from the lab, brutally killing several nurses and scientists in the process.

During Chad's escape, he wrestles with his natural child tendencies after befriending some local children and trying to control his wild primal inner instincts.