Another great tower defense game Starcraft style. You can build units as well as building. The objective is to hold off the zerg forces.

Blizzard is in the process of making their legendary RTS Starcraft. I think the game is mostly done and they are just trying to balance the races. Anyway here is a demo of the protoss. I'm glad the zealot has a new charge ability and the all terrain unit colossus is very impressive.