The Great Gildersleeve (1941–1957), initially written by Leonard Lewis Levinson, was one of broadcast history’s earliest spin-off programs. Built around Throckmorton Philharmonic Gildersleeve, a character who had been a staple on the classic radio situation comedy Fibber McGee and Molly, first introduced on Oct. 3, 1939, ep. #216. The Great Gildersleeve enjoyed its greatest success …