Mrs. Foster

"I chose my name carefully, "Foster", as in a "foster mother" - and these are my children!"

- Mrs. Foster revealing her Adipose

"I'm sorry, am I interrupting something?"

- Mrs. Foster to the Doctor

Mrs. Foster was an alien guardian of the Adipose race and the antagonist in the Doctor Who episode Partners in Crime.

She had come to Earth to foster her children, on behalf of their parents, becoming a nanny to them. She was unique for Doctor Who villains because she never outright killed or threatened humanity; but she was a villain because she acted indifferently to her victim's deaths. She had a plan "to make Britain thin" and she gave the customers pills which melted off their fat and turned it into Adipose creatures which were then collected by her henchmen. Donna Noble discovered the Adipose when one of her friends melted in the bathroom and to her surprise Donna saw an Adipose wave at her and jump out the window.

Mrs. Foster captured one of her employees when she discovered the truth and revealed her goal but the Doctor broke in with Donna and got the woman out. Then the Doctor spoke to Mrs. Foster who revealed her plan to create a legion of Adipose. The Doctor let the Adipose go when their mothership came back because they were only kids; but he had to stop Mrs. Foster because she was intentionally evil. He said that the parents had their kids they didn't need a nanny any more; and the parents disabled the beam and Mrs. Foster fell to the street, dead.