What if Astrid and Hiccup's kids arround 10-12 years old decided to go on an adventure alone hidden from the parents to ride on toothles's children. But then they find out that the hidden world was found by Drago, who wants revenge against Hiccup for humiliating him and has been preparing for this revenge all those years, and sees Hiccup and Astrid's kids as the perfect tool for revenge against Hiccup
