Chessene was the station chatelaine. She was also a subject of Dastari's experimental augmentations, which made her humanoid. After becoming augmented, Chessene displayed vast intelligence and gained the power to read both living and dead minds. Her rough Androgum features softened to human-like in appearance, but she retained her savage Androgum instincts and urges, with both the Second and Sixth Doctors recognizing the danger she posed even as Dastari dismissed their concerns, considering her his greatest work.