The second season begins with the noticeable absence of Ian Hendry, who left the show to do movie work, replaced for these first 3 episodes by Jon Rollason as Dr. Martin King, a character given virtually no background (and Rollason unbilled during the opening credits). "Mission to Montreal" was perhaps the best of the three (and the first to be broadcast), actually centering on King, as Steed doesn't appear until 20 minutes in, engaged to care for an actress en route to Montreal by ship, whose stand-in (Pamela Ann Davy, later seen in "The Living Dead") was murdered in London by a knife-wielding enemy agent (Alan Curtis). The actress, Carla Berotti (Patricia English), possesses a stolen microfilm depicting North America's Dew Line defense system, while Steed keeps an eye on things posing as a steward. Gillian Muir (daughter of actor Douglas Muir, who played One Ten) replaces Ingrid Hafner as Dr. King's nurse, and would appear once more in Jon Rollason's last entry, "The Sell-Out." It must have been a thankless task to do scripts with only a change in the character's name, but the underrated Rollason greatly benefits from his leading role, and his gentle rapport with Patricia English as Carla provides some unusually touching moments, especially after she is shown to be secretly married to the ship's second engineer (Mark Eden, previously seen in "Ashes of Roses"). Patricia English did two further episodes, "The Secrets Broker" and "Never, Never Say Die," but this was her finest showcase. Doing Carla's public relations, Iris Russell went on to do "November Five," but is best known as Father in "Stay Tuned," while John Bennett, as Carla's bodyguard, later did "False Witness." In the second of his 5 episodes, Gerald Sim leaves virtually no impression as a drunken passenger who hardly speaks a word, and is mistakenly murdered in Dr. King's bed. Previously seen in "The Radioactive Man," he later did "The Wringer," "Dial a Deadly Number," and "The Rotters."