Elsewhere, new offerings 'I Know What You Did Last Summer' and 'Smurfs' are no match for the Man of Steel and are both eyeing a domestic opening in the $12 million range.

James Gunn explained why the 'Superman' international box office success is surprising due to the 'anti-American sentiments' internationally.

Superman" film director James Gunn responded to a question about the film not connecting as well with international audiences compared to U.S. moviegoers.

Warner Bros.' "Superman" held the No. 1 position at the U.K. and Ireland box office for a second weekend, adding £4.8 million ($6.5 million) and bringing its total to £16.3 million ($22 million), according to Comscore.