The fourth entry in an ever-more engrossing franchise is absolutely bonkers — and a triumph.

28 Years Later: The Bone Temple picks up where 28 Years Later left off – in a world of zombie-like infecteds and vigilantes that turn out to be a murderous cult.

The Jimmys take their name from their leader, a scraggle-toothed Brit played by Jack O'Connell, who wears an upside down cross and claims to be the son of Satan.