Benefiting from the healing undergone by his predecessor, the Tenth Doctor possessed an outgoing, lively and genial demeanour that hid his underlying guilt.

When the Sycorax leader went back on the deal, the Doctor ejected him from the ship, killing him, proclaiming that he was a "no second chances" sort of man.

As the Sycorax fled, Prime Minister Harriet Jones ordered Torchwood to destroy the ship.

(PROSE: The Christmas Inversion) The Doctor awoke just in time to stop Fadros Pallujikaa's blood control of humanity.

The Doctor challenged the leader to a duel over the fate of Earth.

Many of his relationships with companions were shaped, to one degree or another, by romance; he seemed to genuinely love Rose Tyler as the person who helped heal some of the scars of the Time War, was completely oblivious to Martha Jones' obvious affections toward him, and insisted upon a platonic relationship with Donna Noble.

The departure of each of these companions marked periods in his life where he would abstain from having companions at all, and on one occasion he even stopped having adventures or leaving the TARDIS, with little more than a cat for company.

The First Doctor was shown footage of the Tenth Doctor, as well as his ten other successors, by the Testimony when he expressed doubt over the Twelfth Doctor's identity.

(TV: Twice Upon a Time) When the Third Doctor answered a distress call from Harriet Jones in 2006, he found that his regeneration energy was being siphoned off into a future incarnation of himself.

Experiencing manic hyperactivity, he accelerated the TARDIS' speed.