A terran force defeated a small zerg brood and captured it during the Brood War. Mixing zerg and terran genes, bioengineers forged a small number of mutates to use against the zerg. They ended up in the service of the Alliance.
However, their appearance and sanity left something to be desired—the nanites were all that kept them from reverting to their zerg instincts. These mutates are armed with sharp claws and have a spine-hurling organ in the chest.
Similar experiments were conducted by remnants of the Confederacy using genome manipulation, and by Daelaam scientists using nanotech serum. The subjects of these treatments were not named "mutates" and displayed different features from those engineered by the Alliance.
- Bill Slavicsek, David Eckelberry, Shawn F. Carnes (March 1, 2000). Alternity: StarCraft Edition. Wizards of the Coast. ISBN 0-7869-1618-4
- 2000-10-27. StarCraft: Brood War. Vivendi Games. Mission: Deception (in English). Map Archives: Deception.
- Blizzard Entertainment. StarCraft 64. Nintendo of America, Inc. Mission: Resurrection IV (in English). 2000-06-12.