As they make their way down the mountain, Soo and Tyler quickly discover that the people of the island are no longer human; they have become psychotic cannibalistic monsters with black ooze leaking out of their eye sockets.

The duo battle their way through a mob of monsters and discover Doctor Menlove, a person they had met earlier in the story before the gas was released by the earthquake.

The doctor's transformation has been delayed because he was high on marijuana when the Black Gas came; he explains that the chemicals make the mind and body change, creating an insatiable hunger and a primitive desire to eat and kill.

[3] As Tyler and Soo battle off a group of islanders, the doctor warns them that the toxin from the Black Gas is excreted from the tears and saliva of the infected.

A helicopter flies overhead but rather than offer help it drops a bomb on the hospital where uninfected were taking refuge and then begins tailing Soo and Rader.

[5] Rader begins annihilating the monsters by blowing up gas stations and buildings, only to look up and see a F-117A stealth bomber dropping a nuclear device on the city.

[6] Throughout the series the characters frequently refer to the monsters as Zombies; however they do not fit the classical definitions of being reanimated corpses or will-less people controlled by another.

The Black Gas transforms people and animals into aggressive murderous carnivores that seem indifferent to most injury, but they are definitely not mindless and in fact carry on conversations with their victims.