After a probe with alien samples crashes in the southern part of North America, new life forms begin to appear and half of Mexico is quarantined. As the U.S. and Mexican military struggle to contain these alien creatures, an American journalist agrees to escort a shaken tourist through the infected zone to the safety of the U.S. border.
Special features include filmmaker commentary; deleted and extended scenes; "HDNet: A Look at Monsters"; "Behind the Scenes of Monsters"; "The Edit"; "Visual Effects"; "New York Comic Con Discussion with Gareth Edwards" and more.