Prior to his death, Harry Osborn devised a cruel plan to torture both his father Norman and his former best friend Peter Parker. With the help of Mendel Stromm, he built a secret laboratory in the Parisian Osborn Manor and genetically-engineered two bodies spliced from Norman and Gwen Stacy's DNA: a boy named Gabriel and a girl named Sarah. They were created to torture Peter, Norman, and Mary Jane Watson by making them believe Gwen had cheated on Peter with Norman and got impregnated by him as a result, with Harry going as far as to hiring Mysterio to hypnotize both Norman and Mary Jane to implant false memories which corroborated that narrative. The twins were raised by an artificial intelligence designed from Harry and Norman's minds, who inherited Harry's revenge plots after he died, to believe that lie as well.
Because of a genetic flaw caused by Norman's enhanced blood, the Stacy twins aged at a rapid rate, resulting in their premature deaths. Taking advantage of that, Mephisto, the Hell-Lord to who Norman had sold Harry's soul in exchange for achieving glory, acted through the Osborn A.I. to bring them back to life again and again, forging them in the flames of Hell while they were in his realm. He planned to eventually use them as his pawns to claim Spider-Man's soul, thus averting a future he saw in which the hero's daughter with Mary Jane ended his reign of terror once and for all.
In the meantime, Sarah and Gabriel, ignorant of the truth about themselves and having aged into adulthood within a few short years, were released into the outside world. There, they were manipulated by either the real Norman or the Osborn A.I. into thinking Peter was their real father and also the man responsible for their mother's death. They baited Peter Parker with an "unsent" letter written years ago by Gwen Stacy, where faint traces of writing on the other side "revealed" text stating that Gwen had been pregnant and had twins. Once Peter collected DNA from Gwen's grave, which "proved" that the twins were her children, Mary Jane's implanted memories activated, leading her to reveal Norman Osborn as their "father".
Spider-Man met the twins atop George Washington Bridge to expose Norman's manipulations, as Sarah began to believe Spider-Man, while Gabriel was maddeningly convinced of the lie. Wrongly outraged that "Spider-Man" had abandoned them, misbelieving he was attempting to pawn them off on Norman, Gabriel attacked a reticent Spider-Man who didn't want to hurt him. However, Police became involved and shot the twins, wounding Sarah. Meanwhile, Gabriel escaped and found a base Norman had told them about. Realizing Peter was telling the truth, he injected himself with Goblin Formula and donned a grey variant of the Green Goblin costume, becoming the "Grey Goblin" in an attempt to gain the strength to finally kill Spider-Man. Attacking at the hospital where Spider-Man was saving Sarah's life, Grey Goblin was ready to kill Spider-Man in his weakened state when Sarah intervened by shooting his Goblin Glider, causing it to blow up and Gabriel losing his memories.
After Sarah had secretly taken him home to Paris and cared for him, a drug dealer from their youth came after the two for the theft of $1.5 million dollars of drugs Gabriel stole from him. When the pressure of nursing him and fending off the dealer became too much, Sarah attempted suicide and Gabriel escaped the Osborn estate in a crazed state while she was in the hospital. As he was on the loose, Sarah eventually joined Interpol in an effort to find Gabriel. Found again by Norman Osborn, Gabriel was injected with a Super-Soldier-Goblin Formula.
Years later, a new clone of Gabriel Stacy resurfaced, shooting his half-brother Harry Osborn in a fit of jealousy over Norman's spoils. Leaving him for dead, Gabriel stole the American Son Armor and fled continuing to suffer from the split personality disorder, developed as a result of the second dose of the Goblin Serum. As Gabriel committed crimes as himself, his 'American Son' persona undid the damage, which identified itself as the part of Gabriel's mind that recognized what he was doing was wrong. Recovering from the injury, Harry was informed by his father that Gabriel was his brother.
Gabriel's escapades as both his criminal self and his American Son alter ego continued, often being thwarted by Spider-Man. After kidnapping reporter Norah Winters, Gabriel made another attempt on Harry's life, luring Harry to a vacant warehouse. Harry began to fight Gabriel while attempting to convince him that their father was nothing but evil, but Gabriel ignored him and continued fighting, only for Harry to deactivate the American Son armor via remote. Essentially powerless, Gabriel and Harry became trapped in the ensuing fire resulting from the fight until their rescue by Spider-Man. Gabriel was taken to a psychiatric hospital to receive treatment for his split personality disorder and criminal past. While there, he received a package containing the American Son helmet and a note from Norman saying that he "loved and missed him". However, this left him wondering if he should continue his criminal past or change his beliefs.
After some time, Sarah and Gabriel died from their genetic instability, with an unknown set number of clones being created subsequently. To avoid his future once more after Peter and Mary Jane reconciled and restarted their relationship, Mephisto gave the Stacy twins demonic powers and seemingly bonded them to the Osborn A.I., granting them access to all of Harry's memories and hatred, to break Peter's spirit. Motivated by them, Gabriel and Sarah shared the mantle of "Kindred," planning to torture Spider-Man once they had come back to life.
While Mysterio was tortured in hell, Gabriel appeared before him as Harry and made a deal with him. In return for serving him, Gabriel gave Beck a way to access a new world. Once more living on earth, Gabriel was approached by the Kingpin under the catacombs of Paris. Fisk begged the demon to help him, but got only a "no" as an answer.
Together with his sister, Gabriel haunted Peter Parker as the damned soul of Harry Osborn, also manipulating Norman's awareness of facts into believing such. Gabriel coerced Mysterio into service, murdered Mendel Stromm, and ordered Fisk not to harm Peter, yet grew enraged as Peter and Felicia resumed their friendship. During Kraven's Hunt, he filled Peter's mind with visions of Mary Jane's death, yet spared her when she showed compassion to one of his centipede familiars. After Sarah revived Sin-Eater as their minion, with the power to take the sins from his victims, Gabriel harvested the combined sins to possess the Order of the Web, sending them on a reign of terror across New York before Peter bartered his suffering for their freedom.
With the revelation of Kindred as "Harry," Gabriel brought Peter, Mary Jane, and the Order to a dinner party, citing Peter's past actions as causing Harry's suffering. Gabriel was ultimately captured in a Darkforce cage by Fisk and a cleansed Norman and confined to Ravencroft, where Fisk had Baron Mordo interrogate him for information. However, Gabriel played to Norman's resurfaced humanity to escape and went as Harry to Chameleon in the Hiding Place for his shapeshifting serum before igniting the Sinister War by forcing the participation of Spider-Man's many rogues.
As Spider-Man's multitudes of enemies raced to kill him, Gabriel gleefully watched until Doctor Octopus stopped the fighting to save Spider-Man in revenge for Gabriel reneging on their deal. Meeting Peter to portal him to Paris, their battle culminated in a final confrontation where, despite their best efforts, the Kindreds were ultimately unable to break Peter's spirit as Mephisto wanted and the demon dismissed them. With Mephisto no longer keeping them genetically stable, their rapid-aging disease returned, and Gabriel died with his sister beside Peter.
Demon Physiology: As Kindred, Gabriel was the form of a demon primarily associated with centipedes, gnats, and other forms of insects which associate with the gravearr.
- Resurrection: Kindred can resurrect people, as he did with Spider-Man several times.
- Possession: Kindred is able to take possession of individuals.
- Superhuman Strength: As a demon, Kindred has been shown to be superhumanly strong, easily defeating Spider-Man during their first encounter.
- Invulnerability: Kindred is shown to be invulnerable, as Spider-Man punched through his chest and shot web through his face, neither of which did anything to slow him down.
Fighting Skills: Gabriel has great training in hand to hand combat, marksmanship & strategic & tactical planning.
High Endurance: His amazing constitution allows him to mentally block out pain done from extensive physical damages & allows him to still continue fighting. This naturally developed endurance has made him far tougher and more resistant to injury than the finest peak-human specimen.
Rapid-Aging Disease: Before taking the Goblin Formula, Gabriel aged at a much faster rate than humans (physically aging about 2-3 years in one year). Had he not taken the Goblin Formula, this would have presumably killed him. The demonic powers gifted by Mephisto were also capable of doing that.
- Sins Past writer J. Michael Straczynski originally intended for Peter Parker to be the father of Gabriel and Sarah. However, the editors were against the idea, because having two adult children would have made Peter feel old, and it was decided for Norman to be the father.
- In Amazing Spider-Man (Vol. 5) #74, the Kindred twins are differentiated by the color of their jacket. Gabriel wears a brown jacket whereas Sarah wears a purple jacket. For the archivist purposes of the Marvel Database, this differential will be used to set apart Gabriel and Sarah from each other to determine which twin was acting as Kindred at any given time before the revelation that there were two of them.
- In Amazing Spider-Man (Vol. 5) #73, Gabriel and Sarah are portrayed as empty vessels for their creator (either the Harry Osborn A.I. or Mephisto), with Sarah referring to herself in third person and telling Mary Jane Watson that she "is gone." However, Gabriel and Sarah act as themselves in the following issue. They also appear to be unaware of the Osborn A.I. or Mephisto's influence, and believe themselves to be the real children of Norman Osborn and Gwen Stacy.
- 45 appearance(s) of Gabriel Stacy (Earth-616)
- 4 minor appearance(s) of Gabriel Stacy (Earth-616)
- 1 mentions of Gabriel Stacy (Earth-616)
- 58 image(s) of Gabriel Stacy (Earth-616)
- 9 quotation(s) by or about Gabriel Stacy (Earth-616)
- 2 victim(s) killed by Gabriel Stacy (Earth-616)
- 2 item(s) used/owned by Gabriel Stacy (Earth-616)