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Mission: Impossible launched its third season on September 29 1968 with the episode titled "The Heir Apparent." To save a Balkan monarchy from falling into the hands of Envir Quaisette (Charles Aidman), the IMF concocts a plan built around the legend of Princess Celine, the real heiress to the kingdom, who disappeared as a child and has not been seen for nearly half a century. It is up to Cinnamon to pose as the blind, elderly Celine. But in order to convince her followers that she is the genuine article, Cinnamon must be able to open Celine's puzzle box and reveal its secrets--a task better suited to her IMF colleagues Barney and Willy. "The Heir Apparent" was written by Robert E. Thompson.