Every summer Hollywood delivers a little bit of the unexpected.  It's not necessarily that surprise hit movie or TV show, but a performance you didn't see coming.  Last year it was "Bridesmaids'" Melissa McCarthy. On the TV side you had Jason Gann from "Wilfred." In years past it's been Jonah Hill and Michael Cera in "Superbad" or Abigail Breslin in "Little Miss Sunshine."  2012 should be no different.  

The HitFix editorial team has some insight into the movies and television programs coming your way this summer and we've selected 15 actors and actresses who could potentially become breakout stars over the next few months. Click on the tabs to find out who made the cut and share your thoughts below.