StarCraft: Brood War is an expansion pack released in 1998 for StarCraft — an award winning real-time strategy computer game developed by Blizzard Entertainment.

General information

This expansion provides 3 new campaigns, 2 new units per race, plus some new tech advancements and new map tilesets. The campaigns continue the story from where StarCraft left it: the Overmind has been destroyed with the sacrifice of Tassadar, the Protoss homeworld of Aiur has been destroyed, and Kerrigan is left alone in her new Zerg form.

The first of the new campaigns is the Protoss one, or better the Dark Templars, and mostly takes place on their homeworld of Shakuras. The second campaign features the newly arrived armies of the United Earth Directorate (UED) commanded by Admiral DuGalle, and the last campaign (Zerg) has Kerrigan as the protagonist. Both are mostly set on Char.

Gameplay's story

The last of the Protoss gather on Dark Templars' planet, but the remaining cerebrates (led by Daggoth) meld together to create a new Overmind, and lay siege on them. At last Zeratul and the young templar Artanis manage to activate an old Xel'Naga Temple that wipes the Zerg away.

Meanwhile, the UED manages to capture the newborn Overmind and control it: this upsets Kerrigan, who joins forces with Zeratul and Jim Raynor to eliminate the earthlings and their pet. When they succeed, Kerrigan becomes again leader of the Swarm, and in a final battles eliminates all of her humans and Protoss opponents.

We also discover (in a secret stage) that Kerrigan's lieutenant, Samir Duran, is secretly (and under unknown orders) breeding a perfect Zerg/Protoss hybrid (from here the reference in the ending to an unknown menace that Kerrigan is ignoring).

New Units

In StarCraft: Brood War, each race has new units that change how the game flows.

The Terrans get the Valkyrie (Air-to-Air unit with large attack radius) and the Medic (infantry support unit), the Zerg get the Devourer (Air-to-Air unit evolved from Mutalisk with very a low rate of fire that can afflict a status ailment) and the Lurker (Unit evolved from Hydralisk that attacks while burrowed and has a line-splash attack) and the Protoss get the Dark Templar (similar to the Dark Templar Hero, but runs faster and can transform into Dark Archon), Dark Archon (a spellcaster) and the Corsair (air-to-air splash unit that fires quickly and has a spell that pacifies ground units).

Quotes

 ARTANIS: What do I look like, an orc? ARTANIS: This is not WarCraft in Space! ARTANIS: It's much more sophisticated!