Honor Blackman made her final Avengers appearance as Cathy Gale in this episode, which was originally broadcast on March 21, 1964. The plot is set in motion when a British agent is burnt to death. The only clue to his murder is an odd-looking chess piece, which leads Steed and Cathy right into the clutches of a nasty drug-smuggling ring. Several possible endings were filmed for this episode before the final one was chosen, wherein Steed makes a subtle reference to Honor Blackman's upcoming appearance in the James Bond theatrical film Goldfinger. Written by Richard Lucas, "Lobster Quadrille" wasn't shown in America until April 6, 1991. ~ Hal Erickson, Rovi