What would Hollywood be without superhero movies?

The latest Avengers movie, “Endgame,” is already breaking box office records — and it hasn’t even opened nationally. It’s the latest entry in the genre of films that’s come to dominate the box office over the past decade. Superhero films account for about a quarter of box office revenue, and last year, six of the 10 top grossing films in North America featured superheroes, according to ComScore.