‘Batman v Superman’ is another superhero sequel. It’s a clash of cultural icons. It’s about the politics of military intervention and terrorism. It’s inspired by W.H. Auden and Umberto Eco. It’s the highest-stakes movie produced by a Hollywood studio since James Cameron’s “Avatar.”

“Batman v Superman: Dawn of Justice,” opening March 25, is all these things and more: a 2½-hour, $250 million collection of Hollywood contradictions that could rise above the din of comic book adaptations or sink under its own bloated weight.

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