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TV Shows That Went Downhill After Season 1

2. 'House of Cards' (2013-'18)
The ultimate example. House of Cards begins with House Whip Frank Underwood (Kevin Spacey) playing backdoor politics after being passed over for Secretary of State. His vengeance knows no bounds and his evil plotting is balanced by bright-eyed reporter Zoe Barnes (Kate Mara). But Zoe isn't long for this game, and the show suffers after her shocking departure. It descends into absurdity, in fact, after an OK sophomore season.