Take a look back at the hit shows that contributed to the network's glory days.

'This Is Us'

"This Is Us," a drama starring Milo Ventimiglia and Mandy Moore that moved back and forth in time, became the breakout show of the 2016-17 season. It has been renewed for two more seasons. (Credit: NBC / Ron Batzdorff)

'The Cosby Show'

The most popular TV show of the 1980s
The most popular TV show of the 1980s with Bill Cosby as everyone's favorite TV dad, Dr. Cliff Huxtable (1984-92). (Credit: NBC Photo)

'The Golden Girls'

Four seniors (Bea Arthur, Estelle Getty, Rue McClanahan,
Four seniors (Bea Arthur, Estelle Getty, Rue McClanahan, Betty White) yuck it up in a Florida retirement community (1985-92). (Credit: NBC)

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'ER'

Fast-paced medical drama made a superstar out of
Fast-paced medical drama made a superstar out of George Clooney, who played Dr. Doug Ross (1994-2009). (Credit: NBC)

'Hill Street Blues'

Ensemble drama that revolutionized the TV cop show
Ensemble drama that revolutionized the TV cop show (1981-87). (Credit: NBC)

'Miami Vice'

Glitzy, MTV-influenced cop show starring Philip Michael Thomas
Glitzy, MTV-influenced cop show starring Philip Michael Thomas and Don Johnson (1985-89). (Credit: NBC)

'Seinfeld'

A comedy about
A comedy about "nothing" starring Jerry Seinfeld, Julia Louis-Dreyfus, Jason Alexander and Michael Richards (1989-98). (Credit: NBC)

'Frasier'

"Cheers" spinoff moved Dr. Frasier Crane (Kelsey Grammer) from a Boston barstool to a Seattle radio studio (1993-2004). (Credit: NBC)

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'Friends'

The adventures of six twenty-something Manhattanites (Jennifer Aniston,
The adventures of six twenty-something Manhattanites (Jennifer Aniston, Courteney Cox, Lisa Kudrow, Matthew Perry, Matt LeBlanc and David Schwimmer) (1994-2004). (Credit: NBC)

'Rowan & Martin's Laugh-In'

Wacky, rapid-fire sketch show that introduced Goldie Hawn
Wacky, rapid-fire sketch show that introduced Goldie Hawn and the expression "sock it to me" to the world (1968-1973). (Credit: NBC)

'Cheers'

Comedy set in a Boston bar, starring Ted
Comedy set in a Boston bar, starring Ted Danson as ball player-turned-bartender Sam Malone (1982-1993). (Credit: NBC)