Each character-driven story focuses on one of the engines embarking on an adventure, encountering an obstacle, and learning what it is to be a Really Useful Engine. A range of themes is explored, including Responsibility, Sounds, Helping, and The World Around You. Timeless life lessons, such as the joy of accomplishment, the value of encouragement, and the importance of treating others with kindness, are woven throughout the episodes. The stories are brought brilliantly to life through the use of high-speed digital photography combined with unsurpassed model-making and animatronics.