A troubled mental patient named David Haller discovers that his shocking visions may be the result of him being a powerful mutant.
All bets are off and new alliances are forged as David determines to hunt down the evil Shadow King.
At odds with everyone he once considered a friend, David enlists the help of a young mutant named "Switch" -- whose secret ability is key to his plans to repair the damaged he caused.
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CONCLUDED. Legion ran for three seasons on FX in the United States.