ET has the latest... There's more drama, more romance and more catchy musical numbers in store as Disney's highly anticipated 'High School Musical 3: Senior Year' hits the big screen on October 24 -- and ET has your exclusive first look at the never-before-seen trailer! Zac Efron, Vanessa Hudgens, Ashley Tisdale and the gang all return for the fun flick, which tells the story of the popular crew's last year of high school where they struggle with the reality of being separated from one another once they head to college. Watch ET tonight for more on 'High School Musical 3.' And to see the full trailer, tune in to Disney Channel this Sunday night at 7:55 p.m. Then on Monday, July 14, head to Disney.com for its worldwide online launch!