Derek is a dragon that became a leader of the Dragonfire sqaud along with Taran, Alice, Wendy, Eliwony, Quasimodo, Devon and Cornwall, Batty Koad, Fidget, Lefou, Genie, Elliott, Hiccup, Astrid, Toothless and Sebastian and traveled all of their adventures , met new friends, fighting off new and old enemies and saving the world at all times.