Dr. Sid

In Final Fantasy: The Spirits Within, Dr. Sid is one of the main characters. The only notable connection to any other part of the Final Fantasy franchise in Final Fantasy: The Spirits Within is that Dr. Sid does continue the games' tradition of having a character named Cid appear in most Final Fantasy games, despite the Doctor's named spelled with an untraditional "S", the mentor of the main character Aki Ross. He is a scientist who has discovered energy in "Phantoms" and in humans. He is working on gaining all eight spirits of life to make an "anti-wave" against phantoms, which could save the people and the planet itself.

Dr. Sid's voice was provided by Donald Sutherland.