Arriving back in modern-day England, the TARDIS lands in an actual quarry for a change. Sarah touches what seems to be a fossilized hand and is taken over by the spirit of Eldrad, a Kastrian criminal punished by disintegration, but whose hand has survived, and whose spirit lives on inside the ring on its finger. Sarah takes the ring and goes to a nearby nuclear research station where she uses the energy to recreate Eldrad's body.