The Doctor was fighting against the Daleks and he almost died but his companion( Rose Tyler) sacrifice her self and die the Doctor was so angry that warned them to run away so they did he enter to the TARDIS( Time And Relative Dimension In Space) but he was to old well his body was to old so he have to regenerate and he did. He said goodbye to Rose and regenerate and turn into one handsome guy but he was too sad for the lost of Rose because he love her and some tears came down of his face. Some days later he was in the TARDIS, but he was sad when suddenly a woman was in the TARDIS with the Doctor her name was Donna Noble. But she didn't want to be with him so they said goodbye. 5 days later he found a new companion called Martha Jones and they have many adventures but later they have to separate and she have to stay away from him because she was in love with him. One day Donna wanted to find him And she search everywhere and then she found him and she was very happy.