The original trailer of High School Musical 3 opens with Troy Botlson and Chad Danforth talking about graduation. The clip then cuts to the cast performing "Now or Never," one of the 10 new songs of the film. The young men get ready for the big basketball game and the young women get ready for the big dance. It segues into Bolton singing to his girlfriend Gabriella Montez on the floor during a basketball game. Ultimately the couple discuss saying good-bye after graduation and the trailer ends in a big dance number.

• Zac Efron as Troy Bolton
• Vanessa Anne Hudgens as Gabriella Montez
• Ashley Tisdale as Sharpay Evans
• Lucas Grabeel as Ryan Evans
• Corbin Bleu as Chad Danforth