The following section contains information from StarCraft: Retribution.
The Outback is a desolate region on Aridas. It featured a Dominion outpost which was attacked by the zerg. Holding the line for five days, its defenders were eventually overcome, having run out of resources.
StarCraft: Retribution. WizardWorks Software. Terran campaign: “Strongarm”, mission 6: “The Outback” (in English). 1998.