When LU-LA – a playful and adorable alien – crashes her UFO right next to Mossy Bottom Farm, Shaun jumps at the chance to embark on a new, phenomenal extra-adventure with his old friends to get LU-LA home, but he doesn’t realise that a mysterious government agency is already hot on their heels. Will Shaun manage to avert a Farmageddon in Mossy Bottom before it’s too late?