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.
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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.
He also met Jackie Tyler, who told him she had seen the recently regenerated incarnation.
(PROSE: The Christmas Inversion) When Ace was sent into the Seventh Doctor's mind, she discovered a room with thirteen cubicles, seven of them empty, while the other six contained shadowy white figures, representing the Doctor's future incarnations.
(TV: The Christmas Invasion) The Doctor lost his TARDIS on Serac to a Sontaran squad, led by Snathe.
Trying to get his ship back, the Doctor allied with his old enemies on their mission to locate Thanatos the Worldbane, the greatest super-weapon in creation.
He met his eventual end after he absorbed a huge quantity of nuclear radiation whilst saving the life of Donna Noble's grandfather, Wilfred Mott.
Delaying the process to visit all of his companions, the Doctor finally regenerated in the TARDIS, causing a huge amount of damage due to delaying the regeneration for as long as he did and leaving his successor crashing straight for Earth.
Benefiting from the healing undergone by his predecessor, the Tenth Doctor possessed an outgoing, lively and genial demeanour that hid his underlying guilt.