Sharpay Evans (Ashley Tisdale) performs a dance number at the Lava Springs Country Club ("Gonna Shine"). There she meets a famous producer Jerry Taylor (Pat Mastroianni) who offers her a chance to star in his newest show on Broadway. Sharpay thinks the audition is for her, but it's actually for Boi, her dog. Sharpay later convinces her father Vance (Robert Curtis Brown) to let her move to New York City on her own. He hesitantly accepts, but he has a condition: if the plan backfires, Sharpay is forced to move back with her parents and work at Lava Springs. While in New York, Sharpay is kicked out of her penthouse because they don't allow dogs. While in despair, she meets Peyton Leverett (Austin Butler), an aspiring film director, who offers her a studio apartment. Sharpay accepts but is disgusted to find out what it is. Sharpay, Peyton, and Boi go shopping to give her studio a make over.
The school year ends with everyone at East High School looking forward to summer vacation ("What Time Is It"). Troy Bolton is still dating Gabriella Montez, who decides to stay in Albuquerque with her mother. Troy eventually decides to look for a summer job to gain money for college.
The action takes place at the beginning of 20th century.
Unemployed and homeless Babbs Baberley (Alexander Kalyagin) is being chased by the police who attempt to arrest him for vagrancy. Babbs finds himself in a rich house, where he encounters Charlie and Jackie. Babbs' unsuccessful attempt to disguise himself as a woman gives Charlie and Jackie an idea. By threatening to surrender Babbs to the (successfully bribed) police, they force their unexpected visitor to dress once again as a woman and pass himself for Donna Rosa d'Alvadorez, Charlie's millionaire aunt who is expected to arrive with a visit from Brazil. Charlie and Jackie want Babbs to seduce Judge Criggs (Armen Dzhigarkhanyan) with the irresistible charms of a millionaire widow and to trick the Judge into giving his nieces, Annie and Betty, a permission to marry Charlie and Jackie.
The Lecturer tells an assembly of American parents about the evils of marijuana ("Reefer Madness"). He then launches into the tragic tale of one boy's struggles with the demon weed in the form of a film titled "Tell Your Children". At times, the Lecturer stops the film whenever he details a plot point or to condescend anyone who questions said plot points, such as Mr. Kochinski, whom he calls a commie.
Brady (Ross Lynch) and McKenzie "Mack" (Maia Mitchell), are surfing together at a beach near McKenzie's grandfather's hut. Mack oversees her grandfather and Brady watching their favorite film, where bikers and surfers battle for which gang gets the privilege to hang out at Big Momma's, a local diner and hangout. Brady later learns that Mack made a promise to her aunt that after her mother died she would attend a private school and they were to leave the next day. Mack asserts that although going is her choice, she feels it is what she has to do, since it's what her mom would want. She sadly tells Brady they will have to break up since they will be too far away to maintain their relationship.
Cinderella's Fairy Godmother (Whitney Houston) explains that nothing is impossible in this magical, mystical realm. In the village, Cinderella (Brandy) struggles under the weight of the numerous gaudy purchases of her imperious Stepmother (Bernadette Peters) and her spiteful and envious stepsisters Minerva (Natalie Desselle-Reid) and Calliope (Veanne Cox). Cinderella's imagination wanders ("The Sweetest Sounds"). Disguised as a peasant, Prince Christopher (Paolo Montalban) is also strolling through the marketplace. The two meet when the Prince rushes over to help Cinderella after she is nearly crushed by the royal carriage. They begin to talk and realize they are both dissatisfied with their sheltered lives. She is charmed by his sincere, direct nature, while he is drawn to her naive honesty and purity. Their conversation is cut off when Cinderella's Stepmother scolds her for talking to a stranger. The Prince reluctantly leaves, but tells Cinderella that he hopes to see her again.
Durant l'été 1958, Sandy Young, une étudiante en vacances, rencontre Danny Zuko, le chef de la bande des T-Birds. Leur amour est cependant interrompu par la fin des vacances car Sandy doit retourner chez elle.
Accablée par la pression d'une royauté où elle se doit d'être parfaite, Mal décide de renouer avec ses mauvaises origines et retourne sur l'Île de l'Oubli où son ennemie jurée, Uma, la fille d'Ursula, a pris sa place en tant que reine auto-proclamée des rues sordides de la ville.
Tracy Turnblad, une jeune fille enrobée qui vit à Baltimore, malgré son physique, elle n'a qu'une idée en tête : danser dans la célèbre émission Corny Collins Show. Par chance, ce dernier assiste à une de ses performances au lycée et lui propose de venir rejoindre son équipe.
Fou damour :Devan, un Tamoul qui a passé sa vie en Suisse, accepte de se marier avec la femme que son père Raja désire lui faire épouser. Mais juste avant le début des cérémonies traditionnelles, Devan rencontre Leo, une Européenne dont il tombe fou amoureux.
Été 1963, Baby, fille d'une riche famille américaine, passe ses vacances avec ses parents et sa sœur dans la région des montagnes Catskill dans l'État de New York, à la pension de la famille Kellerman. Elle se trouve mêlée à la vie des employés de la pension et se trouve confrontée à un monde qui lui est complètement étranger, celui de la danse. Malgré le désaccord de son père, Baby va connaître une histoire d'amour avec Johnny, le professeur de danse de l'établissement, issu d'un milieu social très différent de celui de la jeune femme.