From SC2Pod
Zerg Queens have the ability to infest severely damaged Terran Command Centers, saturating them with parasitic bio-toxins. Once the Command Center is fully infested, its previous occupants can be turned into mindless suicide soldiers capable of mass destruction known as the Infested Terrans.
Lore
Once Terran soldiers and civilians, the infested victims of the Zerg are completely consumed by the will of the Overmind. Their bodies twisted and mutated to produce extremely unstable chemicals, infested soldiers long only to find the Swarm’s enemies and destroy them by detonating their own bodies in a cloud of toxic fluid. As with other Zerg ground units, an Infested Terran also has the ability to burrow.
Weapons
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StarCraft 2
The Infested Terran's StarCraft 2 model
The
Infested Terran has returned in StarCraft 2. Instead of being spawned from
Infested Command Centers, it is now created by an
Infestor ability.