Olla

Olla was a female Dreilyn who briefly travelled with the Doctor as his companion.

Biography
Olla had been the consort of the Vachysian warlord Skaroux until she stole his money and went on the run. (DWM: Redemption) She was on A-Lux when Ice Lord Arryx began to turn the planet into a snowy wasteland. Soon afterwards, she met the Doctor and Frobisher, and helped them defeat the Ice Warriors. When Frobisher decided to stop travelling with the Doctor and remain on A-Lux, Olla asked the Doctor take her back to her people, becoming his newest companion. (DWM: A Cold Day in Hell!)

While Olla acted as the Doctor's servant (a role he was not comfortable with), the Doctor's TARDIS was attacked by a Vachysian ship commanded by Skaroux, who demanded that he turn Olla over. At first Olla claimed that she had been Skaroux's slave and that he had been a cruel master, but the truth eventually came out. The Doctor handed Olla over to Skaroux on the condition that she would be given fair trial. (DWM: Redemption)