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Tuala was the niece of Krashen, a soldier from a future Earth ruled by the Daleks.
Biography
Originally a kind-hearted woman, Tuala's attitude towards the world changed when the Earth was taken over by the Daleks.
Along with her uncle Krashen, Tuana stole a Dalek time machine and was transported to the 1970s. With the Dalek time machine damaged, Tuala's attention was drawn to the Third Doctor, the archenemy of the Daleks and the only person on Earth who could repair the time machine. She and her uncle kidnapped the Doctor's assistant, Jo Grant, in an attempt to trap him.
When the Doctor finally tracked them down, he discovered the time machine was causing a temporal paradox and managed to stop the machine before it did any more harm however Tuala had been interfering with time and was killed by temporal energy.