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When a careless scientist spills some radioactive isotope and washes it down the sink, there are reports of something nasty in the sewers. The guys investigate after a team of maintenance men disappear.

The sale of a valuable Samurai sword stirs up old rivalries between a former Japanese Prisoner of War commandant and a British prisoner.

A fleeing spy, who wants to publish his memoirs, seeks sanctuary with old friend Brett; guests Joss Ackland, Kate O'Mara.

A devastating volcanic eruption occurs in the centre of Yellowstone Park. A firefighter and a vulcanologist pool their specialist skills to save as many lives from the catastrophe as possible.

More life-saving exploits in the gripping reality series. In this edition, the team are called to the rescue of a 24-year-old fisherman. Can they winch him to safety?