The story revolves around Princess Comet, a twelve year old girl who is also the princess of the Harmonica Star country of the Triangle Nebula. She was meant to meet the prince of the Tambourine Star country, but the prince ran away to Earth instead. As it turned out, Comet is sent to Earth to find him, though she has no idea what he looks like.
Once she travels to Earth, Comet falls in love with the people she meets there as well as the planet itself, quickly becoming attached to life on Earth. Meanwhile, Princess Meteor learns of Comet's plans to find the prince and to marry him and she arrive on Earth in search of the prince as well, planning to marry him before Comet gets the chance.
Something quite unexpected happens when Annie is forced to spend the summer with her aging, warrior grandmother in the sleepy rural town of Singing Rocks, China. It doesn't take long for Annie and her cousin Yong to find out that their grandmother is the keeper of three secret and powerful masks that will guide them in their quest to be the next generation of warriors to help save the world.
Klaus and Mish, two tiny apple-sized aliens, are dispatched to Earth to prepare an invasion. What can be more impressive to tiny space creatures than rich historical, cultural or natural places in order to establish their headquarters?
Forced to stay with his aunt and uncle for the summer holidays, Tom Long is lonely and bored, until one night he hears the clock strike 13. He suddenly finds himself transported to a magical Victorian garden of the 1880s and meets a girl.