A TV movie directed by Bob Mahoney. Based on the book by Dick Lee & Colin Pratt it tells the true story of a long running Police investigation which resulted in the arrests of 120 people and jail sentences of 170 years for the manufacture and distribution of £100M of LSD.

An alien distress call draws the Doctor and Peri to Earth, 1985, where they uncover a Cyberman plot to change the course of history.