In 484 AD, King Arthur and his knights struggle in a devastating battle against the Saxons. Meanwhile, Merlin begs for help from the Knights of Iacon, a group of twelve Transformers who have hidden on Earth. They give Merlin an alien staff and combine themselves into a huge robotic dragon named Dragonstorm to help Arthur triumph over the Saxons, but not before warning Merlin that a great evil will one day come for the staff.
who is the 3 headed dragon in transformers 5
Dragonstorm