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In Mexico, Solo and Illya are challenged by T.H.R.U.S.H. mastermind Dr. Steller (Paul Lukas), who has created an 18-year-old "superman" named Greg Martin (Christopher Jones). Trained as the perfect assassin, Martin is ordered to test out his skills by destroying an entire village. But problems arise when the allegedly soulless Martin falls in love with Christine Hobson (played by future movie-studio executive Lynn Loring). Capped by an unexpected plot twist, "The Test Tube Killer Affair" was written by Jack Turley, and first aired on September 18, 1967.