Exclusive First Look: Matthew Fox and Jeffrey Donovan Face a New Breed of Zombie in 'Extinction'

The undead have evolved, and it's terrifying.

Matthew Fox and Jeffrey Donovan are facing an evolved version of the undead in the upcoming flick, Extinction.

In this exclusive first look, Patrick (Fox), Jack (Donovan) and his daughter Lu (Quinn McColgan) have survived in the cold, outlasting a zombie apocalypse for the past nine years.

WATCH: Worst Party Ever? Watch MTV's Deadly New Promo for 'Scream'!

The undead have seemingly disappeared, believed to have died off from the frigid temperatures – but the constant fear of outsiders is taking a toll on the last survivors...or so they thought!

When Patrick goes scavenging for food, he discovers that, not only have the undead returned, they have evolved into a terrifying new breed of zombie that goes beyond the imagination.

Watch this video for the creepy new trailer.

Extinction hits theaters July 31.