BF finds himself in a chaotic realm where Angry Birds and Plants vs. Zombies collide. This collision began with darkness merging various branches of space-time into one, leading to the haunting melody of 'Birds and Botany.' As he sings, BF awaits the Pibby Corruption, which has altered the fates of zombies, plants, birds, and pigs, turning them into puppets of darkness. The infected are not dead; their desires manifest in a falsely joyful existence, while some remain aware. Tord emerges to assist Dr. Zomboss after his friends fell victim to corruption. Zomboss's skills in eliminating plants are heightened by darkness. BF confronts corrupted Red and Sam the Peashooter, supported by Chuck, who evaded corruption but bears scars of loss. Alongside Pibby and Daisy, BF must navigate this perilous landscape to rescue Red and Sam before the corruption spreads further.