The wife of Prefect Jaris of Argelius II, a priestess with an inherited empathic gift who senses the ancient evil behind a series of murders and is killed during her own ceremony.
Sybo is the wife of Jaris, chief city administrator on the pleasure-loving planet Argelius II. She appears in the second-season Original Series episode Wolf in the Fold, played by Pilar Seurat. She is descended from a line of priestesses and possesses the Argelian empathic contact.
After Scotty is found over the body of a murdered dancer with no memory of what happened, and a second woman dies, Jaris proposes that Sybo use her gift to learn the truth. She gathers those involved around an altar flame and goes into a trance.
Sybo senses a monstrous, undying hunger that feeds on fear and cries out several names, among them Beratis, Kesla and Redjac. The lights fail, she screams, and when they return she is dead in Scotty's arms with a knife in her back.