This Sunday, ABC is airing Lost episode Epsiode 6.17: The End, which marks the thrilling conclusion to one of the most talked-about series ever produced for the medium of television. This two-and-a-half hour series finale will answer all of the questions we've been asking ourselves over the course of Lost's tense, mind-warping six year run. To help catch you up to speed on what has been happening on the island, we've gathered some of the most important episodes from this past season, as well as episodes from seasons 2-5. Simply click on any one of the Lost episodes below to get started:

Season 6

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Season 5

Season 4

Season 3

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Season 2