Fungus: In a post-apocalyptic adventure in the Swedish archipelago, a science team struggles to find a way to protect the few surviving humans from a lethal mushroom organism. Forced on a journey through the wilderness to find a new bunker in which to continue their research, they come into conflict with an armed gang that uses a drug to delay the effects of the organism. The scientists want to find a more permanent solution, and have to fight for the very survival of humanity.