While attempting to defuse the bomb washed up at Byfield Regis pier, Toby Wren was tragically killed. Quist finds himself wracked with guilt, and facing an investigating tribunal. Under pressure from the inquiry, and confronted by a furious Ridge - who holds Quist personally responsible for Toby's death - Quist turns to a psychiatrist for help. Then Geoff Hardcastle arrives at the Doomwatch office, bringing with him disturbing news concerning horrific genetic experiments being conducted by Professor Hayland. Ridge decides to investigate, but becomes more involved than he was expecting to.