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

First Steps has reached a pivotal point in its theatrical run as second-weekend numbers confirm a significant drop after its $117.6 million debut. Early estimates show a decline of more than 60%. The film now faces growing competition from new releases.

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.