Burt finds and kills a Shrieker in the valley, only to learn it was a part of a government funded project to train Shriekers for rescue missions. But when a storm knocks out the equipment controlling them, the remaining Shriekers escape and multiply. Now to survive, the Perfection residents must make a stand at Burt's place.

Two Las Vegas criminals named Max and Frank have to lay low before their next crime. With time on their hands, they go to Perfection to settle a disagreement about the existence of Graboids. They soon enough encounter El Blanco, which kills Max and also eats the key needed for their crime. And the only way to get it back is to kill El Blanco.

Protesters come to Perfection to force Burt and the others out of the valley, claiming their presence is badly affecting El Blanco's health. This leads to an awkward family reunion when Mindy is apart of the protesters. Even worse, El Blanco begins acting strangely.

Frank returns to Perfection with some help in another attempt to kill El Blanco and retrieve the key he swallowed. Meanwhile, Larry encounters a creature in a barn and tries to figure of what it is.