However, because he was still within the first fifteen hours of his regeneration cycle, he grew a new hand and went on to win the duel for the Earth.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.The fact that he was instantly able to recall the number of Gallifreyan children that he believed had been killed during the war indicated just how keenly he actually felt those horrendous memories.
(TV: Children in Need Special) Crash-landing the TARDIS on the Powell Estate on Christmas Eve 2006, the Doctor fell into a coma after wishing Jackie Tyler and Mickey Smith a Merry Christmas.
He snapped out of it briefly to save Mickey and the Tylers from a Roboform Christmas tree, but the stress of waking up too soon made matters worse and he collapsed again.
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.
When traveling without companions, the weight of being the last Time Lord became much more pronounced.
En route, he convinced her of his identity by reminding her of the first word his predecessor had said to her, before he began to suffer adverse effects from his regeneration.
Experiencing manic hyperactivity, he accelerated the TARDIS' speed.He was unique in that he was the only incarnation of the Doctor who chose to waste and abort one of his regenerations, leaving him with just one left, after being hit by a Dalek ray, channeling the energy into his spare hand without changing his appearance, something his successor would attribute to "vanity issues" the Tenth Doctor had developed from enjoying being the person he was in his current incarnation.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.When the TARDIS was taken aboard a Sycorax spaceship on Christmas morning, he awoke with the help of some tea that seeped into a component of the TARDIS, (TV: The Christmas Invasion) alongside regeneration energy which he seeped from his third incarnation, who had arrived in Jackie's apartment moments before.(PROSE: The Christmas Inversion) The Doctor awoke just in time to stop Fadros Pallujikaa's blood control of humanity.(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.