11 Scripted Primetime TV Shows Have Reached 400 Episodes — How Many Have You Seen?

401 episodes

From the minds Family Guy writers came this animated comedy about a CIA agent, his wife and kids, their talking goldfish, and an alien roommate. After nearly a decade on cable, American Dad! recently returned to Fox for Season 22.

431 episodes

One of TV Insider’s picks for the best Western series and the greatest shows of all time, NBC’s Bonanza was almost canceled after six episodes due to factors including the high cost of filming in color.

435 episodes

This midcentury ABC sitcom — starring married actors Ozzie and Harriet Nelson alongside their sons, David and Ricky — still ranks as the United States’ longest-running live-action TV comedy by episode count.

462 episodes

As with American Dad!, Fox once canceled this animated sitcom, only to bring it back later. Episode 462 was the Season 25 premiere, the holiday-themed “Happy Hell-o-ween.”

471 episodes

This ABC hospital drama’s uncharacteristically short 23rd season will take it through Episode 479. Should Grey’s get a bigger episode order for Season 24, the series could reach the 500-episode mark.

512 episodes

The CBS police procedural, now in its 24th season, marked 500 episodes earlier this year with Season 23’s “All Good Things.” That episode wasn’t all good things, however — it was curtains for one long-serving character.

550 episodes

On Thursday, as SVU airs its 600th episode, the original Law & Order will air “Do No Harm,” its 550th. Had it not gotten the ax at NBC in 2010, and had it not been exiled from the airwaves until 2022, it would be nearing 800 episodes by now.

591 episodes

Airing 19 seasons across CBS and syndication, Lassie lasted so long that several collies played the titular dog. And all those canine actors were (good) boys, since male collies purportedly have more beautiful fur.

600 episodes

Elliot Stabler (Christopher Meloni) is partnering with Benson once again in the NBC procedural’s 600th episode as they examine a decades-old conviction. “This is one of our first cases, and we got it wrong,” a dismayed Benson tells him.

635 episodes

This Western series, based on a long-running radio show, aired 20 seasons between 1955 and 1974 before reaching an anticlimactic series finale. But CBS later got back into Dodge City with five Gunsmoke TV movies.

815 episodes

“The most important thing when you’re thinking about the number of episodes of The Simpsons is not to think about it,” Matt Selman, the showrunner of the Fox animated hit, told TV Insider earlier this year. (And this episode tally doesn’t even include the Simpsons shorts that ran on The Tracey Ullman Show!)