Two friends, Lucy and Parker, discover a cave underneath the stadium while attending a football match in Manchester. Inside the cave lives a cannibal monster who tries to eat them. Later, the children investigate further and realize the monster just wants to be a ballerina. They help the monster, named Suli, pursue ballet. Suli becomes a famous ballerina but struggles with fame and identity. To help Suli find happiness and purpose, Lucy, Parker, and Suli travel the world to meet new people and experience different places.