The Doctor in a renegade Time Lord from the distant planet Gallifrey. But a GOOD renegade. Traveling through time and space in his “borrowed” time machine called a TARDIS…Time And Relative Dimensions In Space. Often picking up various companions along the way to share in his adventures. Most often earthlings. He can regenerate his body 12 times making him nearly immortal. He has, to date, regenerated 10 times, as shown below. He is currently over 900 years old.