The Hills Have Eyes - Trilogy

The Hills Have Eyes : A family going to California accidentally goes through an Air Testing range closed to the public. They crash and are stranded in a desert. They are being stalked by a group of people, which have not emerged into modern times.
The Hills Have Eyes Part II : A group of bikers, which includes some of the survivors from the original film, embark on a journey by bus to a biker race near the desert of the infamous incidents. However, because of a mistake they are late and decide to take a shortcut through the desert. Halfway through the desert the bus breaks down. While trying to repair the bus, some of the group wander off, and wind up in the traps of the survivors of the mutant family of the first. Then the mutants go after the rest ...
The Hills Have Eyes Part 3 (The Outpost) : A top secret experiment intended to produce a superhuman has gone terribly wrong. Now the creators, trapped in a remote desert outpost, are being pursued ruthlessly by their creation. With the door sealed from within, there is no way out.