Many years ago, the ancestors of today's modern sheep were sent out across the galaxy from the sheep home star system of Ovis Aries. A few of these explorers landed on Earth. Their mission was to pose as stupid peace loving creatures, and study the habitat. However, the sheep on Earth soon forgot about their mission, wallowing in grass and sunshine, and they slowly became domesticated by Man.
Now the sheep ancestors have returned to Earth from Ovis, to reclaim their lost flock. To achieve this, without bringing the unwanted attentions of Man, they abducted several Earth inhabitants and supplanted them with the urge to herd, rounding up all the sheep to the fabled Mount Mouflon for the journey home.
However, also visiting Earth is the dreaded Mr Pear, he wishes to acquire the alien sheep technologies in order to rule the universe. He has recruited several characters including an assortment of hench cows, who cause many problems for the sheep and their Shepherds along the way.