LAS VEGAS (AP) -- Not all of Hollywood's summer heroes are decked out in superhero costumes. Some wear maid uniforms.

Stars of the big-screen adaptation of Kathryn Stockett's literary sensation "The Help" helped show off footage from the film Tuesday at CinemaCon, a Las Vegas convention for theater owners.

Co-stars Emma Stone, Viola Davis, Bryce Dallas Howard and Octavia Spencer say "The Help" gives audiences a loving look at ordinary women rising to heroic status amid a summer lineup filled with comic-book action tales.

Due in theaters Aug. 12, "The Help" follows an aspiring writer (Stone) who returns to her hometown in Mississippi in 1963 and encourages black maids to go public about the realities of their lives working in servitude to white families.