Cassandra DeVries is the head of the dataDyne Corporation, making her Joanna and Daniel Carrington's number one enemy.
Perfect Dark
In Perfect Dark, she helps the undercover Skedar in what she believes is an attempt to raise the Cetan ship from the Pacific ocean floor, in exchange for vast amounts of alien technology. To this end, she has dataDyne create the AI Dr. Caroll. She also enlists the help of NSA Director Trent Easton, who tries to persuade the President into lending dataDyne the deep sea vessel Pelagic II.
Trent is unable to convince the president, and dataDyne steal the Pelagic II, and use it to descend to the sunken ship. Joanna Dark follows, and discovers that the Skedar actually intended on betraying dataDyne. Their real intention was to fire a superweapon stored on the ship, which would destroy Earth. Joanna foils their plans and destroys the ship.
The Skedar decide to abduct Cassandra, seeking justice for her failures in helping them. In the end, she and Joanna are imprisoned in the Skedar ship, where she sacrifices herself to allow Joanna to escape, because this is her "best chance for revenge".
In-Game Profile
Analyst note:
The head of dataDyne Corp. Addicted to power; dislikes being anybody's underling. Hates it when she loses the initiative. Is prepared to do extremely unscrupulous things in order to get ahead of her competition, to whit Daniel Carrington, whom she loathes.