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Apocalypse rips the world apart. Finn, a time-traveler, is betrayed—stabbed in the back by his fiancée and his friend—and left to die. He survives and unlocks the Plant Summon System. The summoned plants grow clean and stand guard around his base while others scavenge for scraps. Betrayed and unnerved yet composed, Finn levels up in chill mode. With Cherry Bomb and Doom-shroom he mows down waves of zombies. He recruits powerhouses, wins reluctant allies, and crushes the Zombie Queen before a tense duel with Dr. Corpse. Finn turns Caelum into humanity's last beacon and, in a final hard-won sweep, saves the world—unchanged in effort but forever changed inside.