Tala

Tala was a member of the R1C crew under Jackson on its quest to recover the Minyan race banks from the P7E. Tala deliberately tried to end her life by letting herself age to death because she had already lived for centuries.

She regenerated shortly after the Fourth Doctor, Leela and K9 arrived on the ship, then aided in completing the quest. (TV: Underworld)

She stuck by the Doctor and Leela when they returned to the Minyan ship to protect its landing on New Minyos from interference by Daleks from a future Time War. She stated that, although she had previously been ready to die, she felt a renewed sense of purpose and was prepared to regenerate however many times it took to see the new planet geomorphed into a true new home for the Minyans. (GAME: Lost in Time)

Behind the scenes
Many of the names and incidents in Underworld were derived from the myth of Jason and the Argonauts. Tala is an analogue of the Greek heroine, who was one of the Argonauts in some versions of the myth. (INFO: Underworld, DOC: Into the Unknown)