Xasslyr

 was found frozen in the ice of Iceland. He encountered the Fifth Doctor and Adric shortly after reviving. His hand was missing, which was why Revna Ulfsdottir thought he bore the mark of Fenrir. His armour was damaged because of this and Nyssa helped heal him. Learning of Mars' devastation from the Doctor, he wanted to take over the Earth. He tried to stop Nyssa and the Doctor slowing down his warriors. However, the Doctor tricked him into doing it himself. (AUDIO: God of War)