The Infestor would be the second most important support unit for the Zerg. It does not have an attack but has a wide variety of spells to choose from. It can spawn Infested Terran Marines for support, meaning that en-masse, the Infestor can instantly summon up a large smokescreen or a harassing force. The Marines have limited life though, so the timing must be extra tight. Also, it can cast Plague, which makes affected units deteriorate over time and Neural Parasite, which enables the player to take control of enemy units for a short amount of time. He is fragile, but it is compensated by the fact that he can move while burrowed, a unique mechanic amongst the Zerg units.
