Hämärän vartija was released in the year 2006。Hämärän vartija is also called as A Scanner Darkly, Karanligi taramak, A scanner darkly - Un oscuro scrutare, Mirada a la oscuridad。

The L.A. of a not-too-distant future suffers a surge of drug abuse involving a new ultra-addictive and eventually brain-damaging substance simply named "D". Bob Arctor is an undercover narc leading a double life, dutifully reporting to his superiors while effectively having abandoned whatever normal existence he had for a "D" user/dealer career. But this schizophrenic situation and the drug-induced memory and concentration lapses put Bob under mounting stress.

Hämärän vartija actors and actresses include Keanu Reeves, Ken Webster, Leila Plummer, Natasha Valdez, Robert Downey Jr., Rory Cochrane, Sarah Menchaca, Winona Ryder, Woody Harrelson。