The dancers in Sucker Punch were also patients from a mental institution .
`` In this realm , she befriends four other patients/dancers - Amber ( Jamie Chung ) , Blondie ( Vanessa Hudgens ) , Rocket ( Jena Malone ) , and Rocket 's sister and `` '' star of the show '' '' , Sweet Pea ( Abbie Cornish ) . ''
Sucker Punch -LRB-2011 film-RRB-