Halloween in Neighborville is weird enough, but now Zomboss and his zombie army want to turn the holiday into their own scarier Lawn of Doom celebration! With Zomboss filling everyone's yards with traps and special zombies, Crazy Dave, Patrice, Nate, and a batch of brave, boisterous plants fight back in contests of best tricks, best treats, and best costumes.

Evil mastermind Zomboss wants to build a zombie factory and position his new army in the best location possible, but Crazy Dave, his helpers Nate and Patrice, and their batch of intelligent plants, will try to get the factory for themselves.

Bandette, greatest thief in all the lands, uncovers a clue to the location of the legendary House of the Green Mask! But the sinister Voice is after the same treasure, and sent a deadly assassin after the same secrets! Worse, he's stolen the dearest thing to Bandette's heart. Now, she's after revenge!