When a top-secret program attempted to recreate the original Weapon X experiment that involved the feral mutant Wolverine, they failed to secure a test subject who could survive the bonding process of the virtually unbreakable metal Adamantium to their skeleton. Seeking to take the project in a new direction, the project's director, Doctor Martin Sutter, recruited renowned mutant geneticist Doctor Sarah Kinney and tasked her with creating a clone.
Using the only available genetic sample from Weapon X, which was damaged, they were unable to salvage the Y chromosome after twenty-two attempts. Kinney proposed they create a female clone, and though her request was initially denied, she still went ahead and produced a viable female subject, prompting Sutter to reconsider. Despite resistance from his protégé Doctor Zander Rice, whom Stutter had raised after Rice's father had been killed by a bestial Wolverine at the original Weapon X Project, Sutter allowed Kinney to proceed. As revenge for her insubordination, Rice forced Kinney to act as the surrogate mother for the clone, and she gave birth to "X-23."
Raised in captivity, X-23 was trained to be a weapon. Kinney did her best to ensure the child retained some semblance of humanity, but her efforts appeared to be in vain. After seven years, Rice had X-23 subjected to radiation poisoning in order to accelerate the activation of her mutant gene, and forcibly extracted her claws and coated them with Adamantium. Rice created a chemical compound he called "trigger scent" that sent X-23 into an involuntary berserker rage upon smelling its presence.
X-23's services were sold to the highest bidder. She was left emotionally stunted as a result. Sarah Kinney let her out once, not as an attempt to escape but instead to use X-23 to help her find Kinney's niece, Megan, who has been kidnapped. X-23 found and rescued her with ease. Ultimately, Rice persuaded Sutter to hand control of the program over to him, then secretly ordered X-23 to kill Sutter and his family. X-23 was able to kill Sutter and his wife but was unable to kill their son. Instead she let him live. Later, Rice revealed to Kinney a chamber with dozens of incubation pods containing female clones before he fired her. Before fleeing the facility with X-23, Kinney gave her one last mission - destroy the pods and kill Rice. However, Rice was able to exact revenge on Kinney from beyond the grave, as he had earlier exposed her to the trigger scent, sending X-23 into a rage that caused her to kill her mother. As she lay dying, Kinney named X-23 "Laura".
- 10 Appearances of Sarah Kinney (Earth-616)
- 1 Images featuring Sarah Kinney (Earth-616)
- Quotations by or about Sarah Kinney (Earth-616)
- Character Gallery: Sarah Kinney (Earth-616)
- Fan-Art Gallery: Sarah Kinney (Earth-616)
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