Scott Glenn (BACKDRAFT) has joined the cast of Zack Snyder's SUCKER PUNCH, reports VARIETY. The cast includes Emily Browning, Jon Hamm and Jena Malone. The film is set in the 1950s where a young girl is institutionalized by her stepfather, who wants to have her lobotomized. The girl and her fellow inmates travel to an alternative reality in order to plan their escape. Glenn takes on the role of the girl's mentor.