While Boris is usually stoic and dry, sometimes he needs to unleash his primal side. After escaping the Gulag into a zombie-infested wilderness, he became a zombie killing wildman, doing whatever it takes to survive!

Berserker Boris Outfit
SVT-38 Rifle Bundle
Holiday Season Headgear Bundle
Holiday Weapon Skins
Holiday Season Charm Pack

More details on the official game page of Zombie Army 4: Berserker Boris Bundle ...