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With Bob out of town on a lecture tour, Emily is terrified that she will succumb to the temptation of having an affair with her old flame Steve Darnell (David Hedison). To prevent this, Emily turns to Jerry and Howard for help -- and you know how much help they are. Written by Laura Levine, this was one of several sixth-season episodes in which Bob Newhart did not appear. "It Didn't Happen One Night" first aired on February 18, 1978.