Doctor Who The Doctor looks and seems human. He"s handsome, witty, and could be mistaken for just another man in the street. But the Doctor is a Time Lord: a 900-year-old alien with two hearts, part of a gifted civilization who mastered Time Travel. Brace yourself for some exhilarating experiences and deadly confrontations across time and space. The human race will survive - but only with the Doctor"s help.