Gandalf is a protagonist in J. R. R. Tolkien's novels The Hobbit and The Lord of the Rings. He is a wizard, one of the Istari order, and the leader of the Company of the Ring. From Wikipedia
Filming has commenced at Shepperton Studios under showrunners J.D. Payne and Patrick McKay, kick-starting a time-leaping third season that intensifies Sauron’s rise.