Watch the StarCraft 2: Heart of the Swarm Opening Scene

Blizzard released the opening cinematic to StarCraft II's upcoming expansion Heart of the Swarm Tuesday morning.

The expansion brings new units to the competitive real-time strategy game, as well as a single-player campaign focusing on the bug-like Zerg alien race. The Zerg can be seen in the trailer being attacked by Terran, another playable race in the game.

StarCraft II is one of the world's most popular e-sports franchises, with streaming matches watched by millions. Pro players tested out Heart of the Swarm in front of crowds at Major League Gaming's Spring Championship in June of last year.

StarCraft II: Heart of the Swarm is out March 12 for PC.

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