10 Superhero Sequels That Soared – or Sank – at the Box Office (Photos)

SOARED: "X2: X-Men United": "X-Men" helped launch the current superhero craze in the year 2000, but 2003's "X2" was proof that the public was hungry for more. The sequel grossed $407.7 million — over $111 million more than "X-Men" — and is widely regarded as the best installment of the long-running franchise.

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