In this, Plum Kent and Brinly Allen travel back in time to the age of Vikings. Plum and Brinly have to convince the Dragon Riders to come to the future to go to school at Super Hero Academy. The one bad thing is when Plum fights alongside thee Dragon Riders for the first time, they think she's either half Dragon or a Dragon they haven't yet discovered. How will she explain her alien DNA? How will the Dragon Riders react? Find out in Plum's most exciting adventure yet!