Get ready for some mortal-on-immortal romance. Natalie Portman is the newest star to sign onto the film adaptation of Thor, an early Marvel comic featuring the adventures of the Norse god of thunder. Kenneth Branagh is set to direct and the film will also star newcomer Chris Hemsworth as Thor. Portman plays the god's nurse and love interest, Jane Foster, who gets involved in a love triangle with Thor and his human alter-ego Donald Blake, before briefly becoming a god herself. Marvel Studios says the role will be updated for the film, so surprises might be in store even for devoted Thor fans.