It only takes one... Welcome to WatchMojo and today we’re counting down our picks for the episodes that hurt the reputation of great TV shows and in some cases, represent the point at which a series began to decline. Major spoilers will be discussed, so consider this your warning. Our countdown includes episodes from shows “Lost”, “Battlestar Galactica”, “The Office” and more! What episode ruined your favorite TV show? Let us know in the comments!

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