Catherine before she attacks Griggs and Sanford

Catherine Roth was a Combine agent sent by the Trenchcoat Soldier to invade MacCready's base. She reveals she is a spy when she kills Griggs and Sanford.


In the chapter Empty Coast, Gordon meets Catherine in MacCready's base, and later, during the secret raid at the St. Neal Energy Plant, she shoots Griggs and Sanford, before being killed by MacCready.


Catherine uses the first female model and also has an insignia on her back, which she claimed was won over from a Combine soldier, but it was actually her own all along. She also wears rebel attire.