The Roommate 2: The Obsession is a 2013 Erotic Thriller film and a direct-to-video sequel to the 2011 thriller film, The Roommate. This movie acts as a remake of the 2005 thriller sequel, Single White Female 2: The Psycho. The film stars, Jessica Biel, Katie Cassidy, Sean Faris, Briana Evigan, Megan Fox, Hunter Parrish, Logan Browning, Gia Mantegna, Daniel Craig, Idris Elba, Mark Harmon, Rachel Weisz, Nick Kroll and Gary Sinise.
A young woman, Haley Stewarts, gets accepted into her favorite college that she always dreamed of since she was a child. she meets some friends and ends up having a fling with a guy from a bar, named Kevin. She finds out her one night fling has been more than just a one night thing. Only, she finds out that Kevin has been having relations with her roommate and moves out. She moves in with a clingy, lesbian named, Vanessa. Haley and Vanessa start to gain a friendship, without Haley knowing that Vanessa is a lesbian. Over the course of their friendship, Vanessa gains a sexual attraction with Haley and becomes very clingy and overprotective of her. Vanessa starts to eliminate all the problems in Haley's life, or what Vanessa feels is threatening to herself.
Jessica Biel as Haley Stewarts - The new student at her dream college who handles her new psycho roommate.
Katie Cassidy as Vanessa Bray - Haley's psycho roommate who gains a sexual attraction for Haley and attempts to eliminate all of her own threats.
Sean Faris as Kevin - Haley's bar fling who turns out to be her boyfriend later on.
Briana Evigan as Arlene - She is one of Haley's friends who becomes a target to Vanessa.
Megan Fox as Stacy Rollins - She was Haley's old roommate who slept with Haley's new boyfriend, which causes Haley to move out. She becomes a target to Vanessa.
Hunter Parrish as Rob Sutcliffe - He is a parking lot attendant.
Logan Browning as Ann Carson - She is Stacy's best friend.
Gia Mantegna as Malanya - Vanessa's old friend who use to get stalked by her.
Daniel Craig as Mr. Palmer - He is Haley's boss, who has to choose either Haley or Stacy for an assistant manager's job.
Idris Elba as Detective Besch - He is a detective who tries to help Vanessa.
Mark Harmon as Brian Stewarts - He is Haley's father.
Rachel Weisz as Lauren Stewarts - She is Haley's mother.
Nick Kroll as Stan Carlson - He is Haley's boss who helps her on her business trips.
Gary Sinise as Rich - He is Haley's gay fashion designer.
Stacy Rollins - While Stacy is taking a bath, she closes her eyes and relaxes. Vanessa appears and stabs Stacy in the stomach with a knife and drowns her under the water while she chokes on her blood
Detective Besch - As Det. Besch is helping Haley, Vanessa shoots him in the back with a gun
Vanessa Bray - As Vanessa comes at Haley with her knife, Haley grabs Det. Besch's gun and shoots Vanessa in the chest