DALLAS -- Instead of Super Heroes, maybe they should be called Slurpee heroes. When the first Super Hero movie of the year hits the big screen, you can be sure a 7-Eleven fun-filled Slurpee promotion, with collectible cups, straws and a crazy-colored flavor, isn't far behind ... or in many cases, out in front of the U.S. premiere.

This year, Slurpee heroes, inspired by Thor, a movie from Marvel Studios and Paramount Pictures due to hit theaters May 6, is thundering into participating 7-Eleven stores in the U.S. and Canada for the month of April. 7-Eleven even has a cameo appearance in the film.

In addition to the in-store promotion, special cups and straws, 7-Eleven has added an interactive social aspect with its recently launched Slurpee smart phone app. During the month of April, the app will be re-imaged with a Thor overlay, and visitors will be invited to check in via Foursquare at 7-Eleven stores around the country. With every check-in, Slurpee fans will accumulate prizes and Slurpee Rewards points redeemable by phone or at www.slurpee.com.

Prizes include Thor mobile phone backgrounds, a Thor badge that shows up on the app with check-in, a one-month subscription to Marvel's digital comics and a 30-minute session with Slurpee secretary, 7-Eleven's online concierge service that provides services ranging from answering trivia questions to reporting on sports scores to helping with homework.

7-Eleven has created 10 different collectible cups for its Slurpee and Big Gulp beverages, including two limited-edition molded plastic mugs featuring Thor and the Destroyer, one of the villains in the movie. Among the eight collectible cups are featured Thor's nemesis and step-brother Loki, and Sif, a goddess who carries a big sword ... and a torch for Thor.

Aptly-named Blue Lightning Blast, the bright, turquoise blue Slurpee flavor is described as a thunderous blend of raspberry and tangerine flavors made by Dr Pepper. "There's a reason for the particular success of Super Heroes at 7-Eleven," said Rita Bargerhuff, 7-Eleven vice president and chief marketing officer, in a press release. "Our customers are both enthusiastic supporters of action-hero movies and Slurpee-lovers. They relish a first peek at movies and enjoy supporting products that resonate with them. These fans appreciate the chance to engage in ways that are meaningful and fun and that also build anticipation for a movie's release."