What happens when a clever elf sprays an old tree stump with his magic spray? It transforms into a lively tree dragon and flies with the children Kaj and Kajsa to the land of Once Upon a Time. A legendary adventure begins, filled with dragon battles, knights, kidnapped princesses, and weeks of wedding celebrations – until the anxious question of how to get back home eventually arises. Fortunately, the clever elf has advice for this as well, and the story ends on a positive note.