A British secret service agent is killed near a nuclear submarine dry dock. Hoping to solve the murder, Steed poses as a metalurgist and heads to the shipyard himself. Here he comes face to face with his old enemy Kolchek (Peter Arne), whose plans go far beyond simple one-on-one murder. Nyree Dawn Porter, who according to several sources was the producer's original choice for Cathy Gale (the character played by Honor Blackman during The Avengers' second and third season), guest-starred as Liz Wells. Written by James Mitchell, "Death on the Slipway" was originally telecast June 24, 1961. ~ Hal Erickson, Rovi