The Marvel superhero pic tumbled 66 percent in its sophomore outing domestically, compared to a 53 percent drop for DC's 'Superman.'

Marvel's big summer tentpole held on to the top spot at the domestic box office in its second week of release, and the margin of victory was significant. This weekend's silver medalist, the animated sequel The Bad Guys 2,

Marvel’s First Family might not save the day after all. “The Fantastic Four: First Steps” is quickly losing steam in its second weekend, signaling the comic book adventure isn’t connecting at the box office beyond the film’s core demographic of superhero fans.