The series centered on Throckmorton Philharmonic Gildersleeve (nicknames included "The Great Man" or just "Gildy"), a lovable windbag who first appeared on Fibber McGee and Molly in 1939. On Fibber McGee and Molly he was McGee's antagonist armed with a catchphrase ("You're a haaard man, McGee!"). He was originally expertly played by Harold Peary.
Gildersleeve was so popular that he soon got his own show, The Great Gildersleeve, which debuted on NBC on 31 August, 1941. It was sponsored by Kraft Foods whose advertisements promoted their Parkay margarine -- a weird, oily yellow spread that people turned instead of butter during the Great Depression but strangely continued to eat after butter was affordable again). On The Great Gildersleeve, the titular character retained some of his pomposity and general man-childishness but was made more likeable. And whereas he had a wife on Fibber McGee, on his own he was a lifelong bachelor and much of the plot revolved around his awkward romantic pursuits.