Like Kerrigan, she hatches from your main hatchery after a certain time, or after 1 minute after being killed. She may seem weak at lower levels, but gains some upgrades as levels progress to make her a powerhouse in the early game and onward. Her strength mainly comes from production of lots of throw-away units (save for one type) and overrunning enemies with sheer numbers and attrition.
Zagara is a Zerg commander who seems to embrace the concept of swarming.
