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Under the guise of an LSD addict, US secret agent Vincent Deane (Jacques Denbeaux) has managed to hide some top-secret information in one of his "doped" sugar cubes. Unfortunately, Deane is arrested and placed in a Communist-controlled rehabilitation clinic. Posing as Deane's wife, Cinnamon infiltrates the clinic, hoping to retrieve the cube, while Rollin, impersonating Deane's contact, has himself arrested and placed in the selfsame clinic. Veteran Czech character actor Francis Lederer appears as Brobin. Written by William Read Woodfield and Allan Balter, "A Cube of Sugar" first aired on April 1 1967.