The human world has been saved. After years of fighting, Crazy Dave and his plant army have finally stopped the zombie apocalypse. Dr. Zomboss has been defeated as well as his entire vast army of the undead. But the doctor is unwilling to give up. He'll find a world to conquer so that he could pimp up his army again to finally get revenge on the man that defeated him time and time again.

And his sights are on Equestria.

Penny, overhearing this disastrous plan comes up with a plan. While the amount of energy required to do a dimensional jump would take a long time, enough for the Zombies to take over the defenseless Equestria, there IS enough energy to transport seed packets so that they could defend themselves.

A second later Fluttershy finds some seed packets, and then....

The Zombies....Are Coming....

(A Plant vs Zombies Crossover)