Stevie and Maison have a great friendship where they travel back and forth between the Overworld and the human world. Maison has earned some fame for battling off the mobs at her school, but the attention has also brought about cyberbullies DestinyIsChoice123 and TheVampireDragon555, who have hacked her computer and discovered the portal! Now, through complex coding, the cyberbullies have turned the Overworld into eternal night and unleashed a pack of zombies, allowing their griefing to reach a whole new level.
Things become even worse when DestinyIsChoice123 and TheVampireDragon555 are bitten and turn into zombies themselves. Because they're human and not Minecraft characters, they have all the powers of zombies while retaining their intelligence, creating a new breed of zombies. TheVampireDragon555 is even able to control and rule over the zombies, letting him raise his own army.
Stevie and Maison run for the village to warn everyone, but it's too late: All the villagers have been turned into zombies. In the midst of the eternal night, they'll have to fight off zombies and find supplies to make potions to save the villagers and the Overworld.