This photo provided by Disney/Marvel shows, Scarlett Johansson as Black Widow/Natasha Romanoff, in the film, "Avengers: Age Of Ultron." The movie releases in the U.S. on May 1, 2015. (Jay Maidment/Disney/Marvel via AP)NEW YORK (AP) — “I’ll be back,” the line Arnold Schwarzenegger first uttered more than 30 years ago in that indelible manly monotone, belongs to the Terminator, of course. But it also might as well be the official slogan of the summer movie season.