Marvel "Avengers: Age of Ultron" is heading for a huge opening weekend.Summer movie season officially kicks off May 1. 
While you may have your tickets ready for the "Avengers" sequel, "Age of Ultron" is just start.
More than 100 movies will be released between May and the end of August.
From comedies to big-budget sequels, we've rounded up this summer's biggest movies you should check out.