The present day: just as the Fourth Doctor and Leela arrive in Fetchborough, England, Professor Fendelman prepares to experiment on a fossilized skull which science says should not exist. The skull is actually an artefact of the Fendahl, a god-like being who feeds on the life force of others. It has begun to awaken and kill. Worse yet, others seek to exploit the Fendahl's dreadful power.

• BBC
• Tom Baker
• Louise Jameson
• Denis Lill
• Scott Fredericks
• Wanda Ventham
• Edward Arthur
• Daphne Heard
• Geoffrey Hinsliff