Ruby White

Ruby Anne White was the cover identity of a Katesh who came to Earth intending too feed off of Sarah Jane Smith. She owned an Artificial intelligence that was named Mr White by Clyde Langer. (SJA: Goodbye, Sarah Jane Smith)

History
"Ruby" was imprisoned by her own race, due to her hunger for excitement being greater then any other, on a prison ship, with only a games console for entertainment. She managed to reprogram the device to serve her needs, turning the prison into a ship. She went to many planets draining their inhabitants completely.

When she came to Earth, she posed as a human named Ruby White. Getting close to Sarah Jane Smith, who led the most exciting life on Earth, she managed to weaken and lock her in a basement with her stomach as it slowly drained her.

Luke Smith defeated her by using Mr White to simulate meteors falling to earth on a large scale, causing six billion people to have "thrills" and overloading Ruby White's stomach. Ruby was then returned to her prison by a restored Sarah Jane, but vowed revenge on her and the entire planet. (SJA: Goodbye, Sarah Jane Smith)

Behind the Scenes

 * She is often seen wearing red outfits, having a red front door and driving a red car, as "Ruby" is a sort of red stone.
 * As Mr Smith was able to find extensive information regarding the Katesh's cover identity, it can be surmised that there was an actual Ruby White, whose identity was usurped by the Katesh.