The four factions are:
- Genlab Alpha: Dux, Farrow, Bormin, Moose and Ruben.
- Ark Mutants: Naphta, Danko, Franton, Krin and Hugust.
- Mechatron Hive: Bender, Mecha King, M.A.R.K.14, Wrecker and Scrappy.
- Nova Sect. Plutonia, Psion, Tula, Maxim and Psycho.
This game and its factions are based on the TRPG Mutant: Year Zero. There is a computer game 'Mutant Year Zero - Road to Eden' (good actually) that also is based on the TRPG, but they changed the backstory a bit because they wanted to have animal mutants in their game but they didn't want to add a whole other faction because of it, hence that the Ark in the computer game have animal mutants. They changed a lot of things actually to fit the story into an x-com style computer game.