The Simpsons

The Simpsons remains the longest-running American animated series, with 770+ episodes across 35 seasons, revolutionizing adult animation. Its 90% Rotten Tomatoes average lags behind #5 Game of Thrones' 95% critical rating, and recent seasons draw 2.2 million viewers—a 30% drop from its 1990s peak of 15.8 million. Yet its cultural saturation, including 30+ catchphrases in common parlance and 900+ guest stars, outpaces any other animated show's longevity benchmark, generating $1.2 billion in syndication revenue since 2015.