The Twelfth Doctor was an alternative version of the twelfth incarnation of the time lord known as the Doctor. Born on Gallifrey on 1002 AD, this version of the Doctor has an unknown early history, as his regeneration is not shown or mentioned. This Doctor was witty, though instantly serious when the situation calls for it. He enjoys spending time with humans, describing himself as a xenophile. This is the reason given for his taking of companions, though he also takes aboard a time lord in The Survivor. He sees no cause for general history alterations, taking Ed to the Titanic and even attempting to stop it crashing, though this was to avoid a bigger calamity on history. He happily suggests punching Hitler, though draws the line at stopping World War Two.