Strange lights over the quiet town of Mossingham herald the arrival of a mystery visitor from far across the galaxy. When the intergalactic visitor an impish and adorable alien called LU-LA crash-lands near Mossy Bottom Farm, Shaun soon sees an opportunity for alien-powered fun and adventure and sets off on a mission to shepherd LU-LA home. Her magical alien powers, irrepressible mischief and galactic sized burps soon have the flock enchanted. Shaun takes his new extra-terrestrial friend on the road to Mossingham Forest to find her lost spaceship, unaware that a sinister alien-hunting agency is on their trail.