When Zomboss's sun vacuum is blown up and scattered throughout time and space, Nate and Patrice race against the zombies to see who can gather all the missing pieces first.

A group of young plants--led by Fred the Sunflower, Jeff the Bloomerang, and Grrawrr-Bear the Bonk Choy--move out of Crazy Dave's garage and into his huge family mansion in Neighborville. Nate and Patrice head over with them to make sure they don't accidentally destroy the place, but why is Dr. Zomboss spying on them? What secrets does he hope to learn and convey to his zombie army?