Celeste Rivers

Professor Celeste Rivers was a senior scientist working at the Pharos institute.

Biography
In 2007, She showed Sarah Jane Smith around the institute, much to the dismay of Korst Gogg Thek Lutiven-Day Slitheen, then masquerading as the human child prodigy Nathan Goss. (SJA: The Lost Boy)

In 2008, She thanked Sarah Jane for not telling anyone about the incident with Goss, which could have destroyed the institute. Later, unofficially she permitted Sarah Jane to take away a fragment of the Weserbergland Meteorite kept at the institute. (SJA: The Day of the Clown)

In 2009, she conducted a paranormal investigation at Ashen Hill Manor, aided by Sarah Jane, Clyde Langer, Rani Chandra, and her assistant, Toby. During this time, she was displaced by Erasmus Darkening's machine. She was returned when Sarah shut off the machine, with no memory of her time away. (SJA: The Eternity Trap)

In 2011, she helped Sarah Jane and Rani find out more about the aliens who wanted to capture Sky. When they succeeded, they left Rivers and pursued Sky and her mother. (SJA: Sky)

Behind the scenes

 * She appeared in series 3 and had a bigger role than her first two appearances. Although it had previously been confirmed by the production team, her name was not actually mentioned on-screen until The Eternity Trap.
 * Celeste is confirmed to appear in the Fifth Series of The Sarah Jane Adventures.