Shazar

Shazar was a half-Time Lord who left Gallifrey to pursue power. He had been a friend of the Doctor's when they both lived on Gallifrey. Shazar aided the Daleks in their quest to control time and defeat the Time Lords. He was stopped by the Fourth Doctor with the help of the High Council. As a punishment, Shazar is shrunk back into a glass bottom and he is left on a primitive planet where he can do no harm. (COMIC: Return of the Daleks)