By | September 04 2012 1:41 PM

It was a milestone of heroic proportions. This Labor Day weekend, "The Avengers," the big-budget superhero ensemble from Disney (NYSE: DIS), topped $1.5 billion worldwide at the box office. It is now the No. 3 movie of all time, behind James Cameron's "Titanic" and "Avatar," which have raked in $2.2 billion and $2.8 billion, respectively.