Grey's vs. ER: By the Numbers

In just a few short hours, Grey's Anatomy will make TV history.
When tonight's brand-new episode, the 15th in its 15th season, the beloved ABC drama will officially unseat ER as the longest-running primetime medical drama in American television history! With 332 episodes on the air (as of tonight) and at least 10 more on the way—Shonda Rimes' baby has yet to be renewed for a 16th season, though that seems like a mere formality at this point—the series has done something that, given the state of the current TV landscape, no show of its ilk will likely ever be able to top.
And what's more, it's done it with four of its original stars having run the entire damn marathon. OGs Ellen Pompeo, Chandra Wilson, Justin Chambers, and James Pickens, Jr. have stuck with the show through thick and thin, dramatic cast turnover and ill-conceived musical episodes, monumental pay raises—here's looking at you, Ellen!—and ratings resurgences, have starred as Meredith Grey, Miranda Bailey, Alex Karev, and Richard Webber, respectively, for the amount of time it would take an infant child to get their driver's permit. And at least one of them has every intention of seeing this thing all the way through to the end—whenever that may be.
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