Chantho

Chantho was a female Malmooth, and the last of her kind. She left her dead city and worked with Professor Yana of the Utopia Project. When Yana discovered that he was in fact the Master in Human form, he fatally wounded Chantho with a live electric cable. (DW: Utopia)

Her final action was to shoot the Master, triggering his regeneration.

To be polite, Chantho, like all Malmooth, had to say the start of her name at the beginning of each sentence, then finish with its end. For example, when Martha asked what would happen if she didn't speak that way, her reply was, "Chan-That would be rude-tho."

With Chantho's death, the Malmooth became extinct.