Another lost entry, "The Deadly Air" served to introduce Allan Cuthbertson (first of four), Geoffrey Bayldon (first of two), Michael Hawkins (first of three), and Cyril Renison (first of two) to the long running series, with Douglas Muir's fifth appearance as One-Ten, Steed's superior (the last this season, five more next year). Truscott Research Laboratories is the setting for experiments to devise a new vaccine against a particularly virulent disease. Someone is determined to destroy this vaccine's development, as a test subject serving as guinea pig dies of the disease. Steed and Keel investigate the isolation room, and volunteer to be tested themselves to ferret out the culprit. The second season's "The Golden Eggs" featured a similar storyline.
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