Dr. Judith Mossman is a scientist who plays an integral role in the Half-Life 2 series. She is a cunning and manipulative double agent, aiding both sides during the Uprising but eventually siding with the Resistance. Later on she discovered in an unknown Arctic location a secret and powerful project that could be used against the Combine, in a vanished ship named the Borealis. She is portrayed as a Caucasian woman in her forties.