Years ago, Mr. Zoomzeman, a June bug, and his wife lived in a birch tree filled with insects. During a wedding ceremony, a boss arrives and seizes the tree. At the full moon, Zoomzeman heads to a creek, where he meets a nightfairy, Caroline Schreiber who guides him to her realm. The nightfairy banishes the boss's vehicle and the tree to the moon, leaving Zoomzeman homeless. She explains that the tree can return to Earth only if an animal-loving human accompanies him.
Years later, Peter, David Daria a space-loving boy, lives with his sister Annabelle, Thyra Uhde. One day, Zoomzeman arrives at their home, where Ms. Zoomzeman, Proschat Madani, joins them and urges the two children to head to the moon to save their home. The journey soon splits the pair; Peter meets a sandman, Laurens Walter, while Annabelle finds herself caught up in the trouble already brewing on the Moon.
Annabelle is abducted by the boss, who has become the Moonman, Stephan Benson. Peter, the Moonman, and the Sandman seek out the nightfairy at her palace, where Peter explains Annabelle’s kidnapping and the peril facing their world. The nightfairy grants Peter permission to travel to the moon, hoping to set things right and bring the birch tree back to Earth.
On the Moon, Annabelle discovers the Moonman’s plan to fire a cannon at sunrise in order to exact his revenge on the nightfairy’s realm. She and Ms. Zoomzeman are captured, forcing Peter, Mr. Zoomzeman, and the Sandman to race to the lunar stronghold to intervene and rescue them. The Moonman’s grip tightens as the clock ticks toward dawn, and the inevitable showdown looms.
Together, Peter, David Daria the brave boy, the Zoomzeman family, and the Sandman confront the Moonman. They manage to free Annabelle and Ms. Zoomzeman, and tempers begin to cool as truths emerge and reconciliations form. Ms. Zoomzeman appears to find a path back to harmony with her husband, while Annabelle shares crucial insight about the Moonman’s plan, rallying everyone to stop the catastrophe before it can ruin the nightfairy’s world.
As the Moonman prepares the cannon, the nightfairy’s palace endures the blast. The nightfairy arrives on the Moon and banishes the Moonman to Mars, then restores the birch tree to Earth. Peter and Annabelle return home to a warmer, happier house, and the Zoomzemans feel a renewed sense of belonging as their beloved birch tree stands restored in their yard. In the end, balance is restored: the family reunites, the moonlit danger is averted, and the home once again feels whole.
