Sissy Spacek is returning to the horror genre -- where she enjoyed one of her earliest successes as the telekinetic heroine of 1976's "Carrie" -- as she steps into "The Ring 2" for DreamWorks and director Hideo Nakata. The Oscar-winning actress joins Naomi Watts and Simon Baker in the film, due to start shooting in mid-May. It's unclear exactly who she will play in the ongoing tale of a mysterious videotape that proves fatal to viewers because the script is being closely guarded; sources close to the film said the filmmakers want to keep a level of mystery around Spacek's character. DreamWorks co-heads Walter Parkes and Laurie MacDonald are producing, with production executive Mark Sourian overseeing at the studio. Ehren Kruger wrote the script. Spacek is repped by CAA. She next stars opposite Colin Farrell for helmer Michael Mayer in the Killer Films indie "A Home at the End of the World," which is being distributed by Warner Independent Pictures.