Aspyr Media announced today that it is now shipping Command & Conquer Generals Zero Hour, the first expansion pack for Command & Conquer Generals. The US$29.99 title is expected to arrive in stores by Friday, and was developed for the Mac by i5works. “With new units, structures, and upgrades, as well as the all-new Generals Challenge Mode, Command & Conquer Generals Zero Hour delivers all the firepower players need in the quest to become the ultimate modern warfare General.”