Infested Kerrigan

Infested Kerrigan is a unique zerg hero. She appears in the missions "Agent of the Swarm," "The Amerigo," "The Dark Templar," "Eye for an Eye," and "The Quest for Uraj." She also appears as an invincible, uncontrollable hero unit in "Legacy of the Xel'Naga," "The Insurgent," "To Chain the Beast," "To Slay the Beast," and "The Reckoning."

Kerrigan is a terrifically powerful unit; she has high HP, good armor, and deals massive damage with her normal attacks. With Ensnare and Psionic Storm she can support the player's forces against large numbers of enemies, and can Cloak to scout out enemies and attack vulnerable points. Her major weakness is her inability to attack air units, and heavy-hitting units like s can quickly deplete her HP.

Abilities
Kerrigan is unable to use her Psionic Storm ability in the missions "Agent of the Swarm" and "The Amerigo."