 "Iron Man" was also the number one film in the U.S. and Canada in its second weekend, grossing $51.2 million, giving it the twelfth-best second weekend and the fifth-best for a non-sequel.On June 18, 2008, "Iron Man" became that year's first film to pass the $300 million mark for the domestic box office.The review aggregator Rotten Tomatoes reported a 94% approval rating with an average score of 7.71/10, based on 278 reviews.