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They're everywhere ('Aliens')
The moment where "Aliens" first breaks into full-fledged action-movie mode is the sequence where the hardened marines are attacked from all sides by a virtual army of Xenomorphs. Harkening back to the scene of Dallas's demise in the first film, Cameron deftly utilizes the sound of the motion tracker to amp up the tension, and the way the marines melt down as they're besieged by the slimy horde is gripping. Also notable for featuring Ripley's decisive break from cautious bystander to take-charge warrior. Get out of her way, Gorman.