Grid was possibly some sort of leader to the Xenomorphs in the Pyramid, as it seems stronger and smarter, or at least more tactically adept, than the other Xenos around it.Grid then perished when Scar's Self-Destruct Device detonated, destroying the pyramid and many other Xenomorphs in the process. Grid attacked, but Scar and Lex managed to slip away by activating an emergency winch that hauled them up through the access tunnel in the ice, leaving Grid behind. With the Queen free, Grid returned his attention to Scar, pursuing the Yautja as it attempted to escape to the surface with Lex. Upon reaching the Queen's chamber, Grid and the other Xenomorphs released her by wounding her, allowing her blood to burn through the chains that held her. As Scar began gunning down the Xenomorphs, Grid hid in the shadows to avoid the plasma bolts, before breaking off the attack when the Queen ordered her brood to retreat and join her.

Upon locating the Predator deep within the pyramid, Grid led several other Xenomorphs in an attack, despite the fact Scar was now armed with his Plasmacaster. With two of the Yautja dead, Grid turned his attention to the final surviving Predator - Scar. The wounds also caused Grid's acid blood to dissolve the net and allowed the Alien to escape it immediately pounced on Celtic and killed the Predator with a Headbite. During the fight, Celtic severed the tip of Grid's tail and trapped it with its Netgun, the constricting net carving into Grid's armor and slicing a grid of wounds that gave the individual Xenomorph its name. After dispatching Chopper with a Headbite, Grid attacked Celtic, engaging the second Predator in a brutal brawl. Grid encountered Chopper as the Predator prepared to kill Lex Woods and, seizing its opportunity, impaled the cloaked Yautja from behind with its tail before it was even aware of Grid's presence. After being born, it quickly grew to maturity and began stalking the three Yautja that had come to hunt it and its fellow Xenomorphs. Grid was presumably born from one of the expedition members trapped inside the sacrificial chamber and impregnated by Facehuggers.

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