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

First Steps" held firm at the top of the U.K. and Ireland box office for a second weekend, adding £3 million ($4.1 million) and bringing its total to £15.3 million ($20.4 million), according to Comscore.

Marvel's first family faltered in its sophomore weekend at the box office, recording a 66% dip in North American theaters