He works in Disney Channel 's original movies , High School Musical and High School Musical 2 plays Ryan Evans ( Sharpay 's brother ) . He is also know for playing a role in Halloweentown high and return to halloweentown . He is also famous for his role as Ryan Evans in Disney Channel Original Movie 's 2006 High School Musical and its sequels , High School Musical 2 ( 2007 ) and High School Musical 3 : Senior Year ( 2008 ) , and as Ethan Dalloway in the third and fourth installments of the Halloweentown series , Halloweentown High ( 2004 ) , and Return to Halloweentown ( 2006 ) .