Can't get enough of Disney's Frozen? You're in luck. Your favorite characters from the most successful animated feature ever will return in a new short, Frozen Fever, airing sometime next spring. Once again Elsa's icy powers will wreak havoc, this time at Anna's birthday party, with Kristoff and Olaf along for the ride, Variety reports. There will be a new song, too, from the people that brought you the Oscar-winning tune "Let It Go." It isn't clear how the short will air, but Entertainment Weekly suggests it may accompany the live-action flick Cinderella, due out March 13. Too long to wait? Characters based on Elsa, Anna, and Kristoff will debut on ABC's TV drama Once Upon a Time this season, Hollywood Life reports.