During or prior to the Second Great War, the 21st Assault Division were called upon to investigate the planet of Taurus IV, where a team of Dominion scientists had vanished. Arriving on the planet, the 21st Assault Division discovered that Dominion scientists were killed by zerg. The zerg attacked the base of the team, infecting and turning the surviving forces in infested terrans. Infested terrans were killed by the Daelaam´s forces later.
Numbers of them were spawned on Meinhoff. They aggressively assaulted Jim Raynor's base during the night, but during the day they were inactive and burrowed due to the hyper-evolutionary virus that infected them reacting negatively to the high UV output of Meinhoff's star.
Plot branch : Raynor's Raiders side with Selendis at Haven
Large numbers of infested colonists were created by virophages on Haven by the Zerg Swarm. The infestation was terminated by Raynor's Raiders.
When Sarah Kerrigan lead an assault on Skygeirr Platform, she utilized infestors and virophages to infest the Terran Dominion's housing, creating hordes of infested terrans to swarm the Terran Dominion's defenses. The Terran Dominion utilized a gas that could destroy the infested terrans, but had a limited amount of the gas, and needed time to synthesize more. Eventually, the infested terrans, backed by Kerrigan's swam, broke the outer defenses of the lab, and Kerrigan left the infested terrans outside as a vanguard.
Kerrigan utilized a similar tactic when attacking the Moros, and used virophages to infest the ship's prisoners to use against the Dominion defenses.
During the final assault on Korhal, infested terrans made up the bulk of the forces of Alexei Stukov. Zagara noted that if the city gates were destroyed, infested terran forces could be deployed from orbit to move into Augustgrad. During the final assault, Stukov deployed infested terrans alongside infested marines to assault the palace's western defenses.
During the Daelaam's attack on the host body of Amon, a compound of infested terrans, under the Amon Brood, stood in the way of Artanis. The Daelaam were able to overcome them, and destroy Amon's host body.
This article or section contains information derived from Co-op Missions, and should not be considered part of the official StarCraft storyline.