Videos and When Animals Attack!. After shedding most of these programs, Fox gradually filled its lineup with acclaimed dramas such as 24, The O.C., House, and Bones, and comedies such as The Bernie Mac Show, Malcolm in the Middle, and Arrested Development. As the decade wore on, Fox began surpassing ABC and NBC in the ratings, first in age demographics, then in overall viewership, and placed second behind a resurgent CBS in total viewership, beginning in 2002. Fox hit a major milestone in 2005 when it emerged as the most-watched U.S. broadcast network in the lucrative 18–49 demographic for the first time, largely boosted by the strength of the reality singing competition series American Idol. Regarded as the single most dominant program on 21st-century U.S. television, as well as the first Fox show to lead the Nielsen seasonal ratings, Idol had peak audiences of up to 38 million viewers during the 2003 season finale and double-season average audiences of around 31 million viewers in 2006 and 2007. Subsequently, it leapfrogged over Fox's Big Three competition to become the highest-rated U.S. television program overall starting with the 2003–04 season, becoming the first reality singing competition series in the country to reach first place in the seasonal ratings. Idol remains the most recent U.S. television program to date to lead the national prime time ratings and attract at least 30 million viewers for at least two television seasons. It is the most-watched program on U.S. television by seasonal average viewership in the 2000s decade, as well as the most recent program scheduled to have successfully established a graveyard slot on U.S. television since the end of NBC's Friends in 2004 and the subsequent decline of the network's previously dominant "Must See TV" Thursday timeblock. By 2005, reality television succeeded sitcoms as the most popular form of entertainment in the U.S. as a result of Fox's rise with Idol and NBC's network declines. House, which aired as Idol'''s lead-out program on Tuesday nights, earned international prominence in the 21st century and became Fox's first prime time drama series (and the network's third program overall) to reach the Nielsen Top 10 beginning 2006. Beginning 2004, CBS and Fox, which ranked as the two most-watched broadcast networks in the U.S. during the 2000s, have tended to equal one another in demographic ratings among general viewership, with both networks winning certain demographics by narrow margins; however,