What is Fallout’s Forced Evolutionary Virus? We break down the games’ FEV lore and delve into how the virus fits into the Fallout TV series. Fallout season two, episode five drops a massive bombshell ...

Fallout‘s Forced Evolutionary Virus, or FEV, is an artificial megavirus created by West-Tek’s NBC Division in the mid-2070s. It’s transmissible by injection, direct contact, or an aerosol solution.