The Shadow Kingdom

Kull, a barbarian from Atlantis, has conquered the land of Valusia and now rules over it as king. Little does he know that an ancient race of serpent people are using magic to replace humans with serpent men, and now seek to seize his kingdom. Can Kull battle the serpent people invasion? And if he does, how can he tell ally from foe? Can the power of the sword defeat the evils of sorcery? - Summary by Klaatu