explains the truth and they reconcile, determined to audition for the musical. Overhearing Gabriella and Troy rehearse, Sharpay asks Ms. Darbus to move the callbacks so they start at the same time as both Troy's championship game and Gabriella's scholastic decathlon competition. Kelsi overhears the conversation, and both the basketball and decathlon teams make a plan together. On the day of the competitions, Taylor and Gabriella use the school's computers to delay the championship game by hacking the power in the gym and causing a chemical reaction that forces an evacuation during the decathlon. Troy and Gabriella rush to the auditorium as Sharpay and Ryan finish their callback song ("Bop to the Top"). After Gabriella and Troy successfully perform their song "Breaking Free", Ms. Darbus gives them the lead roles, making Sharpay and Ryan understudies. Both teams win their respective competitions, and the entire school gathers in the gym to celebrate ("We're All in This Together"). Chad asks Taylor out, and Sharpay makes a truce with Gabriella. In a post-credits scene, Zeke Baylor paces alone in the gym, when Sharpay runs in, declaring that the cookies he had given her that she had initially rejected are "genius". She hugs him, and he says he will make her a crème brûlée. Zeke smiles in victory. Cast Zac Efron as Troy Bolton, one of the most popular students at East High School and the captain of the varsity basketball team. Before Efron was cast, the role of Troy was written for a tenor, and Efron, who himself is a baritone, could not properly sing most of the parts. Singer-songwriter and actor Drew Seeley, who also auditioned for the role, provided majority of the character's singing voice, with Efron himself singing the first few lines in "Start of Something New" and "Breaking Free". Vanessa Hudgens as Gabriella Montez, a transfer student who joins the scholastic decathlon team and is attracted to Troy. Ashley Tisdale as Sharpay Evans, an energetic and proud student with a love of theatre and being the center of attention—particularly Troy's who employs her twin brother, Ryan, in her schemes. Lucas Grabeel as Ryan Evans, a member of the drama club who aids his twin sister, Sharpay, in sabotaging Gabriella's relationship with Troy. Alyson Reed as Ms. Darbus, the stern drama teacher at East High who dislikes Mr. Bolton, sports, and cell phones. Corbin Bleu as Chad Danforth, Troy's best