Mad Men star Jon Hamm has joined the cast of director Zack Snyder's action fantasy movie Sucker Punch for Warner Brothers and Legendary Pictures, according to The Hollywood Reporter:

Hamm joins Emily Browning, Vanessa Hudgens, Jamie Chung, Jena Malone, Abbie Cornish and Carla Gugino in the 1950s-set tale of a girl (Browning) confined to a mental institution by her stepfather, who intends to have her lobotomized in five days. She and her friends enter an alternate reality where they begin planning an escape.

Although details for Hamm's character are being kept under lock and key, the name is known: High Roller.

Hamm is currently on view in the third season of his AMC TV show Mad Men. Sci-fi fans may recall his small role in last year's The Day the Earth Stood Still.