GLaDOS is the artificial intelligence antagonist of Valve's Portal series, first introduced in Portal in 2007 and voiced by Ellen McLain. Her cold, deadpan delivery and sudden shifts into frustration made her one of gaming's most quoted characters, and short voice lines from the games have long circulated on soundboards and in fan edits. This repeated no captures that loss of control, which is why creators reuse it for denial, panic and refusal. It remains popular because the robotic voice is instantly recognisable even without any visual context.