Cathiw was a female Betazoid who served as an operative for Betazed Intelligence in the late 24th century.
In 2381, Cathiw and fellow agents Dolorex and Katrot were assigned to telepathically gather intelligence about an unknown vessel that had destroyed several starships without provocation. Disguised as frivolous diplomats, they spent three weeks on Angel I before being transported to Risa aboard the USS Cerritos. In her assumed persona, Cathiw was overtly flirtatious, though she deferred her advances by claiming to prefer those who were "hard to get".
En route, the Cerritos crew began succumbing to telepathic projections that caused them to become emotionally volatile. Zanthi fever was initially suspected, but Doctor T'Ana found no evidence of it. Nevertheless, Captain Carol Freeman was convinced that the Betazoids were responsible and ordered them confined to quarters. Believing that their cover had been blown, Cathiw and the others commandeered the Cerritos and attempted to take it on a direct course to Betazed through the Romulan Neutral Zone.
Just before the Cerritos violated the Neutral Zone, Cathiew, Dolorex, and Katrot were subdued by the ship's security officers. The source of the telepathic projections had meanwhile been found to be Lieutenant jg T'Lyn, and they ceased once she addressed her turmoil regarding her punitive transfer from the VCF Sh'vhal. The Cerritos then proceeded to Risa without incident; before they departed, Dolorex gave Freeman an image of the unknown vessel that the Betazoids had acquired. (LD: "Empathological Fallacies")
Cathiw was voiced by Wendie Malick.