Ellen McLain (born December 1, 1952) is an American opera singer and voice actress. She is best known for providing the voice of GLaDOS, the computer antagonist of Portal, the Combine Overwatch in Half-Life 2, and the Administrator, the announcer in Team Fortress 2. Her voice roles also include the Jaeger A.I. in Pacific Rim and The Witch in Left 4 Dead and Left 4 Dead 2.
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