NBC Must-See TV

NBC's 'Must-See TV' branding, applied to its Thursday night primetime lineup beginning in the early 1990s, described what became the most commercially dominant programming block in broadcast television history. The phrase, popularized by the network's marketing department, reflected a genuine cultural reality: for a decade, American audiences maintained a standing weekly appointment with NBC's Thursday comedies and dramas. At the block's core stood Friends (1994–2004) and Seinfeld (1989–1998), two sitcoms whose cultural reach extended far beyond their broadcast windows. ER (1994–2009), Frasier (1993–2004), and later Will & Grace (1998–2006) completed a lineup that generated NBC's highest advertising rates—prime-time Thursday commanded a premium because it reached the affluent 18-to-49 demographic sought by automotive, pharmaceutical, and financial advertisers. The block's dominance was so complete that CBS, ABC, and Fox essentially conceded Thursday evenings, scheduling weaker programming in the knowledge that NBC's audience was largely captive. When Must-See TV's ratings began declining in the early 2000s, the shift marked the beginning of the broadcast network era's structural decline, as audiences fragmented across cable channels and, eventually, streaming platforms.