the history of doctor who

Doctor who is the longest running tv show in history. Doctor who started in 1963 and was canceled in 1989. So it ran for 26 years by the time it was cancled.The Doctor is a time lord who travels though space and time. The doctor has always had companions. His first companions were his granddaughter susan, susans school teachers barbara and ian, starting with the 2nd doctor was the brigadier and then sarah jane smith was the companion of the 3d and 4th doctors. Because the first doctor was played by a older actor, when the first actor left the show they came up with the idea that the doctor can die but his body can regenerate and he can come back to life. So when one actor leaves the show we see the doctor die then regenerate into the new actor. It,s been said on the show the doctor can only regenerate 12 times. The show finally came back in 2005. This new series is a continuation of the old series. The show also has had spin off series like the sarah jane adventures, torchwood. This new season will see the start of the 11th doctor.