Major Story Arcs
Boom Boom Mushroom
The Boom Boom Mushroom lives secretly in a cave below Neighborville until Crazy Dave and Twister find him. They leave him alone, but later, Dave decides they need his power to combat Zomboss’s most recent plan–to drop all of Neighborville below the surface, into some caves.
Dave tells the Patrice and Nate to find the Boom Boom Mushroom so it can blow up the hydraulic elevator that is key to Zomboss’s plan. They use Twister, a pig-dog with a sensitive nose, to try to find him.
The Boom Boom Mushroom watches them as they go through the caves but does not announce himself.
Eventually he shows up of his own accord and explodes, defeating a horde of gargantuars. Unhurt, he, Nate, and Boom Boom then run to find the elevator. When they find the elevator, however, Twister rewires it so it brings the zombies to the city surface, where the plants defeat them. The Boom Boom Mushroom seems to continue to stay with them instead of retreating to its subterranean realm.