MERCENARIES--Dwayne Johnson, Anthony Mackie and Mark Wahlberg in a scene from "Pain and Gain." (AP Photo/Paramount Pictures, Jaime Trueblood) by David Germain LOS ANGELES (AP) — "Iron Man 3" was the heavy-lifter at theaters with a colossal overseas debut that overshadowed a gang of mercenary bodybuilders in a sleepy pre-summer weekend at the domestic box office.
