A business trip to Russia turns into a battle for survival for two American web entrepreneurs (Emile Hirsch, Max Minghella) and the tourists (Rachael Taylor, Olivia Thirlby) they meet in a Moscow nightclub, as the city is attacked by invisible, energy-absorbing aliens whose touch turns humans to dust. Intense sci-fi actioner from director Chris Gorak ("Right at Your Door") also stars reproduce the original theatrical experience. Widescreen (Enhanced); Soundtracks: English DTS HD 5.1 Master Audio, Spanish Dolby Digital 5.1; Subtitles: English (SDH), Spanish; audio commentary; deleted scenes; extended scenes; extended scenes; featurette; bonus short "The Darkest Hour: Survivors" (2011). Two-disc set. Also includes a Blu-ray 3D that requires a 3D television, 3D Blu-ray player, and special glasses to reproduce the original theatrical experience.