Prince Amleth is on the verge of becoming a man when his father is brutally murdered by his uncle, who kidnaps the boy's mother. Two decades later, Amleth is now a Viking who's on a mission to save his mother, kill his uncle and avenge his father.

Dangerously ill with a rare blood disorder, and determined to save others suffering his same fate, Dr. Michael Morbius attempts a desperate gamble. What at first appears to be a radical success soon reveals itself to be a remedy potentially worse than the disease.