Harmony Cubs are fantasy creatures from a world beyond the stars. Their mission is to work together to bring peace and harmony to their world and other worlds. They enter other worlds through a hidden portal and help Earth children when they are in troubhle and appear to them as imaginary friends. They use magic for good to stop those who want to harm children. Harmony Cubs have different personalitties and talents which they can use to help others and get out of trouble. The are led by Luas the Puppy, who is a portal traveller. The source of his power is in his tail, which he uses to find portals and enter other worlds. Luas is the only way the Harmony Cubs can enter the hidden portals.