Once upon a time, in the Happy Kingdom, lived people who were always happy. The reason is because of their top knight, Sir Greatness. He has defended them from the forces of evil for ten years making their lives peaceful and full of joy. However, when he has no choice but to leave to stop the evil Angry Kingdom he returns with a fright. While he was out a dragon showed up. The prince informs him that this dragon destroyed much of the castle and devoured many of the people. She even ate his mom and dad making him the new king when he is not ready for that. Sir Greatness heads out to find this female dragon and avenge the ones she consumed. The dragon headed out in the Dark Lands so Sir Greatness must be ready to face the dangers out there in order to reach his target and avenge his people.