"Tunnel Rat", often shortened to "Rat", was an otherwise unnamed member of the United States Colonial Marine Corps. She was a member of the Colonial Marine Berserker unit dispatched to TodLab LXI in response to the Xenomorph outbreak there.

The mission to TodLab LXI was a failure, with most of the team being killed and a Xenomorph Queen escaping the destruction of the station. Rat was one of only two Marines to escape alive, along with the team's commander 'Bort.



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