StarCraft II: Heart of the Swarm is the second expansion for the popular real-time strategy game StarCraft II. Released in March 2013, it focuses on the Zerg race and continues the story of Sarah Kerrigan, who seeks revenge against the Terran Dominion after being transformed back into a human. Players control Kerrigan as she leads the Zerg in battles across various planets. The game introduces new units and abilities for the Zerg, enhancing gameplay and strategy. It features a single-player campaign with a rich narrative and multiplayer modes that allow players to compete against each other online. The expansion has been praised for its engaging story and gameplay mechanics.