EXCLUSIVE: Watch Ashley Tisdale Repel An Alien Attack In 'They Came From Upstairs'

She's helped revitalize the song and dance genre with "High School Musical," and now she hopes to do the same for alien invasion flicks. Come July 31, Ashley Tisdale will star in "They Came From Upstairs," a teen-friendly flick about Tisdale and a gaggle of friends helping starve off an extraterrestrial assault.

Check out the exclusive trailer premiere below, and then click here to hear more from Tisdale about the film.