Sitcom crossovers were once major TV events, uniting beloved characters from different shows for unforgettable moments. From George Jefferson on The Fresh Prince of Bel-Air to Steve Urkel on Full House, and the New Girl & Brooklyn Nine-Nine mashup, these collaborations sparked conversations among fans.

However, with the advent of streaming, network rivalries, and a flood of content, the sitcom crossover has nearly vanished—until now. The unexpected crossover between It’s Always Sunny in Philadelphia & Abbott Elementary demonstrated that, when executed well, sitcom mashups can still create magic.

Share your favorite TV crossover moment in the comments!

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