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Until the fall of 1948, regularly scheduled programming on the four networks—the American Broadcasting Company (ABC), the Columbia Broadcasting System (CBS; later CBS Corporation), the National Broadcasting Co. (NBC), and the DuMont Television Network, which folded in 1955—was scarce. On some evenings, a network might not offer any programs at all, and it was rare for any network to broadcast a full complement of shows during the entire period that became known as prime time (8–11 pm, Eastern Standard Time). Sales of television sets were low, so, even if programs had been available, their potential audience was limited. To encourage sales, daytime sports broadcasts were scheduled on weekends in an effort to lure heads of households to purchase sets they saw demonstrated in local appliance stores and taverns—the venues where most TV viewing in America took place before 1948.

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Although a television set cost about $400—a substantial sum at the time—TV was soon “catching on like a case of high-toned scarlet fever,” according to a March 1948 edition of Newsweek magazine. By autumn of that year, most of the evening schedules on all four networks had been filled, and sets began appearing in more and more living rooms, a phenomenon many credited to comedian Milton Berle. Berle was the star of TV’s first hit show, The Texaco Star Theatre (NBC, 1948–53), a comedy-variety show that quickly became the most popular program at that point in television’s very short history. When the series debuted, fewer than 2 percent of American households had a television set; when Berle left the air in 1956 (after starring in his subsequent NBC series The Buick-Berle Show [1953–55] and The Milton Berle Show [1955–56]), TV was in 70 percent of the country’s homes, and Berle had acquired the nickname “Mr. Television.”