One of the more promising lost entries from season one, "Kill the King" introduced several familiar faces to the series, Patrick Allen (first of two), Burt Kwouk (first of three), Peter Barkworth (first of four), and Lisa Peake (first of two), with Moira Redmond in her second of two (after the debut episode "Hot Snow"). King Tenuphon (Kwouk) of the Far Eastern nation of Champur, is en route to London to sign a treaty granting a valuable oil concession to Britain. Steed's assignment is to assure the King's safety at all costs, for dissidents in his own nation reject the treaty outright. An assassination attempt aboard the plane results in the wounding of Prince Serrakit (James Goei), the would be killer thrown out to his death by Tenuphon's bodyguard General Tuke (Patrick Allen). In London the King's suite is targeted nearby by Major Harrington (Ian Colin), who admits that he rather likes Tenuphon but insists on his demise. David Keel is mostly absent, busy working at the maternity hospital while his nurse Carol (Ingrid Hafner) renders medical services as needed. The conclusion is a genuine surprise, one that would set a pattern for future storylines.