Who's sister protects a boy from him?
The film opens with a group of scientists searching the New Mexico desert, who are killed by a mutant named Pluto.
Later, Bob Carter and his wife, Ethel are traveling from Cleveland, Ohio to San Diego, California for their silver wedding anniversary. With them are their children Bobby, Brenda, and Lynn, Lynn's husband Doug, Lynn and Doug's baby daughter Catherine, and their two German Shepherds, Beauty and Beast. At a gas station in the desert, they meet an attendant named Jeb, who tells them of a short-cut through the hills. 
Not long after taking the supposed short-cut, their tires are punctured by a hidden spike strip. Doug and Bob go look for help, while the rest of the family stays behind. Beauty escapes from the trailer and, when Bobby chases her into the hills, he finds her mutilated body cut open. Frightened, he runs and falls, knocking himself unconscious. A young female mutant named Ruby finds him and protects him from her brother Goggle.
As Doug heads towards the interstate, he finds a huge crater filled with numerous abandoned cars and other items. Meanwhile, Bob arrives back at the gas station, which appears to be open yet isolated. Inside, he finds news clippings detailing various disappearances that have occurred in the area and realizes the attendant purposefully led them to danger by suggesting they take the short-cut. He also finds a severed ear and flees from the station. Outside, he finds a hysterical Jeb, who commits suicide in front of him. Bob then attempts to flee in an abandoned car, but is attacked by the mutant leader, Papa Jupiter, and dragged into the mining caves by Jupiter, Jupiter's eldest son Lizard, and Pluto.
Goggle