From SC2Pod
The Ghost is a versatile Terran infantry unit that can attack both air and ground units and use powerful abilities. The Ghost's concussive damage makes it less effective against larger units, but in such cases it can use abilities such as Lockdown or even call down a Nuke to cause great damage.
Lore
Ghosts epitomize the height of human evolution and physical conditioning. Born with incredible psionic potential, these agents are quarantined by the Confederate Government and trained from infancy to channel their psionic energies to augment their natural physical strength and endurance. As a precautionary measure, Psychic Dampeners are surgically implanted in all Ghosts.
Cloak
The most unnerving of these agent’s skills is the ability to cloak themselves from enemy detection. This ‘invisibility’ has earned the
Ghosts a fear-inspired reputation for their mysterious battlefield tactics. Older models of the Ghost Hostile Environment Suit may not be equipped with a personal cloaking device, but they may be retrofitted with them in the field.
Weapons
Abilities
| Lockdown [edit]
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| Energy cost
|  100
|
| Requires
| Lockdown Upgrade
|
| Used by | Ghost (SC1)
|
| Immobilizes a target mechanical unit for about 60 seconds. The locked down unit cannot move or attack, but can be damaged and repaired.
|
| Nuclear Strike (SC1) [edit]
|
| Requires
| Armed Nuclear Silo
|
| Used by | Ghost (SC1)
|
| Calls down a devastating Nuclear Strike. The Ghost must continue spotting for the Nuke until it is about to land. If the Ghost is killed too soon, the strike may be averted.
|
Upgrades
StarCraft 2
The Ghost's StarCraft 2 model
The Ghost has returned in StarCraft 2 but it has been modified slightly. While its Cloak and Tac Nuke Strike abilities remain, the Ghost has lost it's Lockdown and gained the Sniper Round and EMP Round abilities. These changes will likely make the Ghost a much more offensively geared unit, and hopefully cause it to be used more than it was in StarCraft 1.
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100
100
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