was shortened to one hour, to gave priority to Dateline NBC (3rd Rock was also moved from its original Tuesday night to Sundays). Meanwhile, Wings, NewsRadio and Larroquette were moved from Tuesdays from Wednesdays, to gave priority to Mad About You which after one season on Sunday nights, it was dropped out from the lineup; and Caroline in the City, which was also moved from its original Thursday night to Tuesdays. The trend would continue until the 1998-99 season, when the Sunday comedy night was officially dropped out, being replaced by two hours of Dateline, followed by the NBC Sunday Night Movie. Frasier returned to Thursday nights after Seinfeld ended its run, taking its 9:00 PM timeslot (eventually it was moved back to Tuesdays starting with the 2000-01 season until the show ended in 2004). Decline By the early 2000s, Friends and ER were still performing strong on Thursday nights, with the former series reaching number one on the Nielsen ratings during its eighth season. However, as the decade was progressing, the "Must See TV" slogan had fallen by the wayside in NBC's promotions; more importantly, NBC had gone from the top-rated network on Thursday nights to second behind CBS, eventually third behind ABC and ultimately a distant fourth behind Fox, but NBC itself didn't develop hit shows to replace long-running staples Friends, Frasier, Seinfeld, and Will & Grace. After airing a two-hour comedy block on Thursday for 21 straight seasons, NBC broke with tradition in 2004 by replacing the 9 p.m. hour with the hour-long reality competition program The Apprentice, although its Thursday night lineup retained its top 20 position. Thursday programming has also become increasingly stronger on other networks. CBS was first to break through with its lineup of Survivor, CSI: Crime Scene Investigation, and later Without a Trace. For the 2010–11 season, CBS moved the highly rated comedy The Big Bang Theory, which had become the highest-rated sitcom in the United States, to the Thursday 8:00 p.m. slot, and Two and a Half Men to the 8:30 p.m. slot, which earned very strong ratings. ABC had success on Thursday nights with its hit reality series, Dancing with the Stars, before moving the program to Mondays in 2006 (where it has remained since). In the fall of 2006, sophomore drama Grey's Anatomy was moved to Thursdays to counter CSI; ABC's lineup of Ugly Betty and Grey's Anatomy has