Fallout Season 2 Episode 5 Finally Mentions Forced Evolutionary... (2026)

Eagle-eyed viewers, or just those who are as nosey as I am, may have spotted something particularly interesting towards the end of the latest Fallout Season 2 episode: The first mention of the Forced Evolutionary Virus (FEV).

After breaking out of Vault 31, Norm and the rest of Bud's Buds travel the Wasteland and arrive at the old Vault-Tec HQ, where Norm manages to find a working terminal and hacks in to discover what the company had planned for Vault 31, 32, and 33.

It's only on screen for a second, but the following pops up: "F.E.V. (Forced Evolutionary Virus) is the gene-altering… agent for organism supercharging. The following is a…" Unfortunately, Norm doesn't get to see any more as he's rudely interrupted by an unsettled Ronnie McCurtry, who fries the terminal and then attacks Norm.

We won't see the fruits of this virus, at least not yet, but it does play a massively important role in Fallout's story, so for those who are curious, or again, nosey, let me explain what exactly FEV is and what its purpose is in the Wasteland.

FEV is an artificial virus created before the Great War by the defense contractor and research organisation West Tek, in its NBC (Nuclear, Biological, Chemical) Division. We've actually seen a representative of West Tek in the TV show already, as Leon Von Feldon, a pre-Great War West Tek scientist, was actually around the table with Barb when she uttered the famous line "War never changes." He is also mentioned in Fallout and Fallout 3.

During said meeting where Barb suggested Vault Tec could give each corporation present vaults of their own, which they could do what they wanted with, Feldon actually briefly suggests: "What about using a vault to develop a Super Mutant soldier using illegal immigrants?" Classic West Tek.

FEV forces both the genotype and phenotype of organic beings to change so others can easily modify it to whatever their desire is, one step towards creating the 'perfect' human. And the vault Feldon is referring to here is likely Vault 87, found in the Capital Wasteland.

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The virus is mentioned in pretty much every Fallout game as its the driving force behind the Super Mutants who roam the Wasteland and is part of experiments enacted by the Enclave, you know that scary looking place from Season 1 with all the scientists and Belgian Malinois, as well as being utilised by Fallout 1's final boss, the Master, for

Source: PC Gamer