"Leader" was an otherwise unnamed Sergeant in the United States Colonial Marine Corps. He was in command 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. Leader was killed by the squad's own Berserker unit, Shitkicker, when he attempted to shut the rampant mech down because it threatened to inadvertently destroy the station and the team.