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In December 2499, Private Collins was deployed to Mar Sara as part of Third Squad, 417th Confederate Marine Platoon. The platoon was assigned to retrieve a piece of Confederate equipment. Third Squad was assigned to spearhead the reconnaissance of Oasis. There they discovered creep, of which Collins asked if it was safe to step on.
Collins survived the initial firefight with the zerg at Oasis. During the escape, he reported Private Esson was being swarmed over by zerglings. Collins suggested rescuing the waylaid marine but the situation was desperate and he was ordered to keep running. In the confusion and following nuclear strike Collins went missing and didn't arrive at Bunker Complex 3847.