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| - David travelled with the 12th Doctor for a short amount of time, but both of their lives have been connected for quite a long time. David was first seen as a main character in Season 1 Episode 6. He was the Captain of the expedition that was led to the moon of Antiok. It was there that he met the Doctor for the first time initially, but in reality he had met the Doctor on one other occation, whether David knew this is unknown. David escaped the moon with the Doctor and Zack and was brought back to earth by the Doctor. It was told that the Doctor was going to ask him to join him in the tardis, but after learning his name he decided it was best not. David was once again reunited with the Doctor in Season 2 Episode 1 and it became known that David was going to become the Seasons main companion. The two cured the infected humans and David decided to travel with the Doctor. But their trip was cut short when the two stumbled upon Crastoff the Cromatrite who had somehow survived Season 1 Episode 7. It was there that the Doctor was infected and turned into a Cromatrite and David was the only one who could save him. He forged a trust with the 13th Doctor who too somehow survived Season 1 Episode 7. David tried to save the Doctor by killing Crastoff, who came back to life short after, but he failed as the Doctor was taken over by the Cromatrite toxin and changed into the Cromatrite Leader. David then travelled away with the time travelling device, knowing he was unsuccessful to save the Doctor, but he did not give up. He ended up at Mount Callos where he put up a good fight against the Cromatrites and managed to travel away before the Mountain exploded (As Mentioned in S1E4). He then ended up at the Battle of Hastings, where he met a man who unbenowest to him was bitten by a cromatrite. The last place he travelled to was back to Zack's house where he met Zack once again, who agreed to help David save the Doctor. When the Doctor and Crastoff arrived in the tardis, the two heroes engaged in a struggle against the Doctor and Crastoff. The Doctor mortally wounded David and knocked him to the side. Soon enough Zack saved the Doctor by reminding him who he was, and the Doctor turned back to his normal self. The Doctor was now petrified of what he did to David. The only way for David to survive was for the Doctor to send him away with the time travelling device, which using David's DNA would heal him of his wounds. The Doctor sent David away to live another day.
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