The Adventures of Luca and Kai: The Celestial Samurai (Book 2 of 3)

Five years have passed since the crew of The Esby heroically saved the children on the moon. Luca and Kai have become celebrities, with the story of their bravery becoming known worldwide. But some doubt them, and after years without seeing their former crew, Luca and Kai begin to doubt themselves. That is until a familiar face returns, threatening the existence of Earth itself. Will the courageous brothers be able to stop The Celestial Samurai?