A SCANNER DARKLY charts the mental unraveling of Bob Arctor. Arctor is an undercover who has been assigned to track a group of individuals who include the druggily verbose Barris, the hyper intense Luckman, the ultra paranoid Barris and the beautiful Donna. As the film unfolds and Arctor finds himself abusing substance D in order to maintain his facade, his mind begins to spin out of control, to the point where he doesn't know what's real and what isn't. Director Richard Linklater Star Winona Ryder, Robert Downey, Woody Harrelson Special Features: Widescreen, Commentary, Featurettes.