The Tenth Doctor was the tenth incarnation of The Doctor in the modern Doctor Who.
Unlike his immediate predecessor, who was plagued by melancholy due to his actions during the Last Great Time War, the tenth Doctor possessed an outgoing, lively and genial demeanor that hid his survivor's guilt.
Most of the time, the tenth Doctor was able to successfully project a convivial and even frivolous front. However, when he had to engage in conflict, the tenth Doctor's energies would shift toward heroism to reveal a fiercely protective man. He resolutely guarded what he held dear, could be viciously unforgiving to the forces that dared menace them.
At several points in his lifetime, he was reunited with former companions Sarah Jane Smith and K-9, both of whom originally travelled with the Fourth Doctor.
Like the Fifth Doctor, he wore a pair of glasses when examining things. These were his "brainy specs", which he wore to make him look "a bit clever". He also wore trainers as part of his outfit, another trait shared with the Fifth Doctor.
Like the Third Doctor, he died due to radiation poisoning, and later regenerated into the Eleventh Doctor.
- He appears in most sets.