Disaster is brewing at Mossy Bottom Farm: the clumsy Farmer somehow manages to destroy the entire pumpkin crop, putting the town’s festival in jeopardy. Genius Shaun the Sheep decides to fix the problem with science, but something goes terribly wrong: the Farmer disappears, and a Hairy Monster is howling in the woods. Now Shaun, Bitzer the dog and the whole woolly crew must save the farm from a fluffy apocalypse.