Aliens: Thanatos Encounter is a 2001 video game published by THQ for the Game Boy Color.
A group of marines is on their way back from a training mission when they get awakened from hypersleep by a distress signal from the Weyland-Yutani space freighter Thanatos. They go to investigate and find that things are wrong, way wrong.....
Players choose one of three marines, each with his/hers own special attribues (speed, stamina), and then get briefed for your mission. Players get an overhead view of his marine, bottom of the screen is either one weapon and a Motion Tracker or just a gun that must be held with two hands or two smaller guns. Gameplay consists of making his way through about 12 levels with mission objectives ranging from save the lone scientist to finding a new experimental weapon to kill the Queen.