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 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,