Infestation (Tutorial mission)

Infestation is the second stage of the tutorial campaign for StarCraft II. It teaches the basic of how to play the zerg race.

History
With the arrival of the 21st Assault Division on Taurus IV, a broodmother in the area rallied the zerg under her command to repel the invaders. A hive cluster with a spawning pool and roach warren were established, and forces were brought in via sacs. The zerg then attacked the 21st's base, overwhelming their marines and breaking their lines. The commander of the 21st was able to get out one final distress signal before falling. The surving members of the 21st were infested.