Mutant Year Zero: Seed of Evil is an expansion for the tactical adventure game Mutant Year Zero: Road to Eden. This expansion continues the story from the original game, providing players with extensive new content and gameplay opportunities. Players can explore new locations and engage with a new character, Big Khan the moose, while navigating challenges that threaten the Ark and its inhabitants.

The gameplay experience is enriched with new maps, enemies, and gear, allowing players to enhance their characters' mutations and strategies. The narrative focuses on unraveling the mystery of the ominous roots that have invaded the Ark, requiring players to confront various foes to reclaim lost ground. With hours of additional content, Seed of Evil offers a compelling continuation of the Mutant Year Zero experience.