Scourge (StarCraft II)

Scourges appear in StarCraft II: Wings of Liberty as environmental ambiance in missions ; they appear in the protoss mini-campaign and in the Char missions. They are last seen as a special form of attack by leviathans, dealing 500 damage each.

In StarCraft II: Heart of the Swarm, scourge are launched from scourge nests as part of scripted events in "Fire in the Sky".

A "scourge spore" exists in Heart of the Swarm beta files.

Co-op Missions
The scourge is exclusive to Zagara in Co-op Missions, and require a scourge nest to mutate. Upgrades for the scourge are unlocked when Zagara reaches Level 4. As in the original StarCraft, scourge mutate in pairs.