Gray Fox, also known as Frank Jaeger, is a pivotal character in the Metal Gear Solid series. Originally a mercenary and close ally of Solid Snake, he becomes the enigmatic Cyborg Ninja after being revived by Dr. Clark. As a cyborg warrior, he possesses enhanced strength, speed, and a deadly high-frequency blade. Throughout the series, Gray Fox struggles with his past and identity, ultimately seeking redemption. His complex relationship with Snake and his tragic fate make him a memorable and iconic figure within the Metal Gear universe.