The Professor's first regeneration
The Professor was a Time Lord born on Gallifrey. When he was 125 he met the Doctor, he was so impressed by the Doctor he tried to follow in his footsteps and get a TARDIS after years and years the Time Lord finally gave him a Type 57 TARDIS. Once he recived it he ran away from the time lords to explore the universe and meet the Doctor. He really enjoyed teaching early species about the universe therfore gaining the title The Professor. After hundreds of years of exploring the Universe he finally died in the destruction of Gallifrey.