Latest Pirates of the Carribean movie to include Zac Efron http://www.telegraph.co.uk/news/new...ron-signs-for-Pirates-of-the-Caribbean-4.html Disney's High School Musical heartthrob Zac Efron has been added to the cast of the fourth installment of Pirates of the Caribbean. Reportedly, terms of the contract include Efron starring in another High School Musical movie which he previously stated he would not be a part of. Johnny Depp has already agreed to another Pirates movie. He is currently filming Tim Burton's "Alice in Wonderland". It is believed that Keira Knightley will also be a part of the upcoming Pirates of the Caribbean movie which is rumored to be based on a search for the Fountain of Youth.