X-Men: The Phoenix Saga (2000)

An animated feature-length adaptation of the Phoenix Saga, one of the most famous comic stories of all time. A near-omnipotent force of nature, Phoenix absorbs the identity of Jean when the X-Men travel into space to stop the evil emperor, D'Ken. Can the X-men prevent D'Ken from becoming the ultimate power of the living galaxy and what has become of Jean and Phoenix?