Crewman Hevelin was a human in Starfleet assigned to the USS Enterprise (NCC-1701) in the late 2260s. Crewman Hevelin was assigned to the Enterprise's Security division. In 2268, Hevelin was a member of the second landing party that visited the planet Anomaly. On that planet he was eaten by a plant while saving Huff. (TOS novel: Planet of Judgment)