Forced Evolutionary Virus

A biological weapon designed to enhance soldiers that created the wasteland's most dangerous mutants.

The Forced Evolutionary Virus is a mutagenic agent developed before the Great War by the United States government.

Quick Facts

Origin: Pre-War United States Government
Notable outcome: Creation of Super Mutants

Lore & Background

In Fallout (1997), the player character must thwart the plans of a group of mutants, led by a grotesque entity named the Master. In Fallout 2 (1998), the Chosen One comes into direct conflict with the Enclave, described as the autocratic remnants of the pre-war United States government.

Did You Know?

Fallout (1997) was originally intended to run under the GURPS role-playing game system, but a disagreement over violent content led to the creation of the SPECIAL system instead.
Fallout 2 (1998) takes place eighty years after the events of the first Fallout game.
Fallout 4's story begins on the day the bombs dropped: October 23, 2077.