In the Battle of Fire Base Chimera, the base came under attack by the zerg, which infested at least one of the troops, Gunnery Sergeant Andre Madrid, a survivor from Chau Sara. Protoss troops under the command of Executor Tassadar later entered the base, attempting to rescue any terran survivors. The protoss discovered Madrid and killed a small number of zerg who had arrived to "welcome" him into the Swarm.
Metzen, Chris & Samuel Moore (March 29, 1999). "StarCraft: Revelations." Amazing Stories 596 (Spring): 20-27