In the playroom, the Princess and Prince fashion paper masks of a knight and a dragon, propelling them into a fantasy world. In a fairy-tale medieval castle, the cunning Dragon-Prince has captured the sorrowful Princess Bona! The Princess, embodying a brave knight, scales the castle walls to free her beloved dog Bona, but then the sly Dragon-Prince corners them. What to do? Fortuitously, the Princess devises a clever solution: she offers the dragon some apples from behind her back as a peace offering, which turns the fierce dragon into a friendly companion for the knight and princess.