An opportunity arises for Del to make his fortune, but a missing statue and gang warfare create problems.
The Doctor and Sarah Jane find themselves in a gravel pit. Sarah Jane finds a fossilised hand and removes a ring from it, placing it on her finger. She is knocked unconscious by a rock-breaking explosion and is taken to hospital. Possessed by an alien from Kastria, she takes the hand to Nunton Nuclear Power Station, where the hand re-grows a finger and begins to move!