Features:
*Three seperate storylines intersecting and coming together into one final conclusion.
*Play as both Terran, Zerg and Protoss.
*Heavy focus on quality terrain and environments.
*Custom soundtracks and several interesting Hero units.
*24 missions pitting you up against many different challenges and mission scenarios.
*A total of 14 boss battles pitting you up against a variety of different tacticts and strategies.
Story:
It all starts with Investigator Maxwell Reeves of the Spec-Ops: Infiltration Program, who sets surface on the planet Callithus IV to assist the Terran settlers with what initially appears to be a minor Zerg problem. However, they soon realize that events has been set in motion that will potentially change the fate of the universe, and it will be up to the different clans to work together against stopping this threat.
http://www.sc2mapster.com/maps/starcraft-ii-annihilation-campai/