High School Musical 3: Senior Year may not hit theaters until October - but fans can get their first look at the blockbuster when its trailer will premieres this Sunday at 7:55 p.m. ET/PT on the Disney Channel.

"We're paying homage to the fans by debuting our first look on the very network that launched the franchise," said Mark Zoradi, president, Walt Disney Motion Pictures Group.

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The entire cast of High School Musical 3 - Zac Efron, Vanessa Hudgens, Ashley Tisdale, Lucas Grabeel, Monique Coleman and Corbin Bleu - appeared on ABC's Good Morning America earlier today.

For his (hot!) part, Efron talked about coming into rehearsals a few weeks late because he was busy shooting another movie, 17 Again. He said couldn't keep up with girlfriend Vanessa Hudgens; we assume he meant on the dance floor:

Posted in: High School Musical

High School Musical Quotes

Everything's been stepped up a few notches, all the dances, and I think the songs are pretty catchy this time around. And it's our senior year, so we've got graduation and prom to look forward to. All fun things to have in a movie.

Zac Efron [on High School Musical 3]

You never know with teenage girls. It's funny. But they're always, most of the time they're pretty respectful, and I love 'em. I'm very grateful.

Zac Efron