Two-year-old Luna Kyra Barton lost her parents in a car accident just a few months ago. Her older brother, Malachi Barton, now has full guardianship over her - even while juggling his acting career and the Descendants/Zombies: Worlds Collide Tour. Luna travels with him across the country. She's sweet, shy, and secretly very sad - but she hides it behind her stubborn dream of being "a big girl." Throughout the tour, Luna becomes the heart of the cast - loved, protected, and doted on by everyone from Freya Skye and Mekonnen Knife to Kylie Cantrall, Malia Baker, Dara Reneé, and Joshua Colley. As they travel from city to city, she bonds with each of them, faces little adventures and fears, and slowly heals from the loss she doesn't fully understand.