NEW YORK (AP) — “Saturday Night Live” was built with a cast of young no-names performing countercultural comedy. Fifty years later, it is firmly part of the culture, dictating mainstream comedy instead of throwing spitballs from the margins.

NBC is celebrating the legacy of “Saturday Night Live” on Feb. 15 with the first-ever “SNL” telecast airing at 11:30 p.m. ET/PT as well as an encore of presentation of the critically acclaimed documentary “Ladies & Gentlemen … 50 Years of SNL Music” to start the night at 8 p.m. ET/PT.

If it felt like “Saturday Night Live” took to the airwaves in 1975 with a renegade spirit, 50 years later it’s become not only a late-night tradition, but traditional. Hitting the half-century mark is a milestone.