"I'm the Doctor. I'm a Time Lord. I'm from the planet Gallifrey in the Constellation of Kasterborous. I'm 903 years old and I'm the man who is gonna save your lives and all 6 billion people on the planet below. You got a problem with that?"
The Tenth Doctor was the tenth official incarnation of the Doctor. Unlike his immediate predecessor, who was plagued by melancholy due to his actions during the Last Great Time War, this Doctor was much more outgoing and genial, a demeanor that hid the "survivor's guilt" that had plagued him since the war. Towards the end of his life, however, the weight became much more pronounced, haunted by enemies believed long-dead and events that threatened the fabric of time itself.