Sole (The Face of Evil)

Sole was the father of Leela and a warrior of the Sevateem. When Leela refused to take the Test of the Horda after questioning the existence of Xoanon, he offered to take it for her. When he did so, he failed and was killed. (TV: The Face of Evil)

Sole was very proud of Leela when she made her first kill. However, he placed his arms around her to comfort her as he knew that she was upset that it marked the end of her childhood. (AUDIO: The Night of 1000 Stars, The Evil One)

He taught Leela how to heal animals' wounds with moss. (AUDIO: Zygon Hunt)

The Master and the Salonu later brainwashed Leela into thinking that she had killed Sole, stood over his body and laughed. (AUDIO: The Evil One)

According to one account, Leela and Andred had a hybrid child, later known as the Other, who helped found Time Lord civilisation before being loomed into the First Doctor. (PROSE: Lungbarrow) This would make Sole the Doctor's grandfather.