Joe Saxe, a former Science Ninja Team member presumed dead, resurfaces under mysterious circumstances. Concealed initially from both team and audience, he operates under the codename "Hawk," filling the vacant G-2 position once reserved in his memory. This reassignment sparks deep emotional conflict within the original team, who had resisted replacing him. Physically, Joe is now a reconstructed cyborg, a transformation whose full extent and purpose remain shrouded in secrecy early on. His true identity is deliberately hidden, even from his teammates, fostering suspense. Emotionally isolated, Joe grapples with the burden of his new existence. He distances himself from former comrades, undertaking solo missions with a colder, detached demeanor. This stems from fears about their reaction to his cyborg state and his own internal conflict, depicted through actions reflecting his turmoil. A significant subplot involves Jun. Production materials indicate she discovers Joe's cyborg identity early and provides secret assistance. Her initial sympathy evolves into romantic feelings, explored most prominently during a perilous North Pole mission where she accompanies him, demonstrating deep concern. Their interactions suggest growing closeness and reliance. However, this romantic element was downplayed as the series progressed, leaving it unresolved. Combat-wise, Joe retains his core skills in marksmanship and tactics, wielding distinctive feather shuriken. These actions sometimes hint at his survival, like a found shuriken prompting teammate speculation. Joe's arc culminates in a sacrificial act. During a critical mission against antagonists Gel Sadra and her monstrous creation, he executes a final, self-destructive attack. This results in his definitive death, concluding his story with themes of redemption and commitment to the team's cause.