PvZ Battles/Cooperation Mode

The Cooperation mode (Co-op) is a popular mode in PvZ Battles.

Campaign 1
Crazy Dave sends out a group of plants to find his taco. They find it attacked by imp horde. After succesfully  defending it, Crazy Dave decides to go to Suburban Anti-Zombie meeting to discuss zombie problem. On the  way there he is getting ambushed but thanks to plant forces makes way to the meeting. (Co-op missions 1-1 and 1-2)

Meanwhile, a patrolling group of plants has stumbled upon a rebel group of plants, which attacks the patrolling group. (1-3)

This was a sign to make a move and Anti-Zombie forces find the dangerous chemicals in an old castle, which turned out to be the base of rebel group. After a fierce battle, the castle was fortunately detonated by Anti-Zombie forces. (1-4)

This caused a wild beast, Giga-Gargantuar to awaken and cause horrifying  destruction up north, where autumn was already present. Anti-Zombie forces send out another group of plants to stop the great creature and save many lives. Defeating ancient beast from 2009 granted plants the power of grass effect. (1-5)