On Halloween Eve at Mossy Bottom Farm, excitement turns to dismay when the clumsy Farmer ruins the pumpkin patch. Shaun tries fixing it with science experiments, but things go wrong when a wild beast appears in the woods.
The new adventure sees the residents of Mossy Bottom Farm looking forward to Halloween - until the clumsy Farmer trashes the Flock's beloved pumpkin patch. When Shaun turns mad scientist to fix the problem, things rapidly spiral out of control, leading to a wild beast roaming the woods.