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

Sometimes it's doubling down … sometimes it's going to the well one too many times

SOARED: "Iron Man 3": "Iron Man 2" was a huge hit in 2010 after collecting nearly $624 million from theaters around the world, but Tony Stark's latest adventure was an even bigger hit. The sequel broke box office records and has grossed over $1.2 billion to date.

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