Unlike his brother Zim (from Zim s'imagine), Luna is a little red-haired, hot-tempered cat. While his feline furry friend scurries and climbs around the house, Luna grrrr's and growls, being his grumpy self. With their piercing eyes, pudgy bellies, and little pillows on their feet, even the best of us can't resist to cats! But if they make us laugh, cats aren't always in a good mood… Will Luna's human and his brother be able to cheer him up?