Missile turret

The Missile Turret is a Terran defense building designed to take out air units and to detect both invisible and burrowed units.

Background
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In-Game unit
The Missile Turret is the Terran equivalent to the Zerg Spore Colony. They are best used in groups or in conjunction with Terran Bunkers.

Missile Turrets in Starcraft II
Missile Turrets feature in the gameplay footage of Starcraft II released in May 2007. Interestingly, they have been shown in the Artwork Trailer to be able to attack the Protoss Colossus units; whether this is because Missile Turrets are now able to attack ground targets, or because the Colossi are so tall that they qualify as air units, is unknown.