Ninth Doctor

The Ninth Doctor (Also known as Christopher Eccleston) is one of the Doctors. He serves as the secondary antagonist of Season 4, and then a major protagonist for Season 5 onwards.

Personality
The Ninth Doctor is one of the most emotional incarnations of the Doctor. He hides his sorrow with a façade of wit and manic energy.

There are times where he makes decisions within the heat of the moment without thinking them through. He is also prone to overlooking some obvious details or falling for minor deceptions.

Once he joins the Doctor's army, the Ninth Doctor still retains the selfless and caring attitude of most of his other incarnations, never once hesitating to put himself in harm's way to save those around him.

Role
The Ninth Doctor is first seen in the second episode of Season 4, where he seemingly helps the Eleventh Doctor and his friends from an army of animated Scarecrows. However, it turns out he is creating a body for the Time Lord criminal, Morbius.

Throughout the Fourth Season, he assists Morbius in committing various atrocities because he believes that he has lost all faith in humanity. However, as the season goes on, he begins to question whether Morbius is in the right by when it comes to killing people, especially when he destroys a whole Sea Devil base.

In the Season 4 finale, once Morbius falls to his death and Omega is arrested by UNIT, the Ninth Doctor decides to join the "winning team" (The Doctor's army) and helps them find the other incarnations of the Doctor.