Marvel’s first family stumbled in theaters in its second weekend, but still held on to the top spot at the box office. “The Fantastic Four: First

“The Fantastic Four: First Steps” grossed an estimated $40 million at the domestic box office over its second weekend in theaters, according to early estimates —falling below expectations and marking a steep decline after debuting at $117.6 million a week earlier.

First Steps,” the first film about the superheroes made under the guidance of Kevin Feige and the Walt Disney Co., earned $118 million in its first weekend in 4,125 North American theaters, according to studio estimates Sunday.