Every. Simpsons. Ever. is a marathon of The Simpsons run by FXX.
End logo from a TV promo
Episodes that was broadcast from August 21 through September 1, 2014 on FXX. The block featured all 25 seasons (552 episodes) of the show that ran for 12 days. The show broke the record for the world's longest TV marathon. The record was later beaten by VH1's SNL Rewind (2015 — 1975) with 19 days.
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Every Simpsons Ever is also a block that airs on FXX every day from 2:00PM to 5:00PM. The block is ongoing and unlike the marathon of the same name, it doesn't air all episodes in order and plays a few episodes in a randomized order instead.