A brilliant but unstable scientist who led a group of young followers to seize the Enterprise in search of the mythical planet Eden.
Dr. Sevrin is a gifted engineer and acoustics expert, a Tiburonian who leads a band of young idealists searching for the legendary planet Eden. He is also a carrier of a deadly disease, which he refuses to accept.
After his group is rescued by the Enterprise, they seize auxiliary control and take the ship into Romulan space, threatening the crew with a lethal ultrasonic sound. Eden proves beautiful but poisonous, and Sevrin dies after eating its acidic fruit. He was played by Skip Homeier.