Sheldon Leonard, executive producer of I Spy, essays one of his traditional "heavy" roles as Sorge, an American traitor and jewel fence. Assigned to retrieve a valuable microfilm from Sorge, agent Kelly Robinson offers to trade the film for a diamond watch, which Kelly has been forced to steal from one Phyllis Lauder (Julie London). When Sorge kidnaps Kelly's partner Scotty and holds him for $50,000 ransom, Kelly has only three hours to pay him off -- requiring him to again rely upon the largess of the outraged Phyllis. Written by Morton Fine and David Friedkin, "Three Hours on a Sunday" first aired December 8, 1965. ~ Hal Erickson, Rovi