From FreeSpace Wiki
Hellwolf is a campaign originally released for Descent: FreeSpace in 1999.
Author: Hsiong "mr. sunshine" Chen and Lloyd "Twisted Ivory" Lin.
The Hellwolf Chronicles follows a story set in the universe of Descent Freespace. You play Jason Cade, a man outside the Galatic Terran Alliance, on the fringes of civilization where pirates and outlaws rule. Each individual mission is part of an interlocking campaign that advances the story of a society being invaded by Terrans, Vasudans, and Shivans.