Doctor Who is the longest running science fiction TV show. There is one main character, The Doctor, who has the ability to travel through all of time and space with his Tardis.The tardis stands for “Time And Relative Dimension In Space”. The Doctor is from an alien planet from gallifrey. They call themselves time lords. Time lords have the ability to regenerate 12 times Which enables the doctor to live for thousands of years. The Time lords fought a great and mighty war against another alien species, the daleks. The doctor was able to save his planet but the cost was heavy. He kept Gallifrey in a separate universe, invisible to ours. It was the only way to save his people. Ever since, The doctor traveled through time and space rescuing civilisations in need.