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Four of Marvel's biggest heroes are each working individually but have one common goal in mind -- to save New York City. Burdened with their own personal challenges, Matt Murdock (Daredevil), Jessica Jones, Luke Cage and Danny Rand (Iron Fist) realize that they likely won't be able to accomplish their goals working solo. That realization leads them to team up and form The Defenders, a supergroup that is more equipped to save the Big Apple than the heroes would be if they continued to work on their own. Wikipedia