Jack Flower was sixteen years old when he first enlisted in the United States Army, having lied about his age. After serving a stint in Korea, he was later assigned to Camp Washington where he had been promoted to the rank of Major. He met Captain Adeline Sorrows who was tasked with training young soldiers in new fighting techniques in anticipation of brewing troubles taking place in Vietnam. Sorrows was amazed at how skilled Jack was and how quickly he adapted to modern conventions of warfare. She immediately fell in love with him, and realized that he was without a doubt the most able-bodied combatant she had ever encountered. She offered to privately train Jack in guerrilla warfare. In less than a year, Jack mastered every fighting form presented to him and was soon promoted to the rank of Lieutenant Colonel. Six months later, Adeline and he were married and she became pregnant with their first child. It was at this time that the war in Vietnam began to escalate and Jack was shipped overseas. At home, Adeline gave birth to their son Grant.
Some time later, Jack volunteered for a medical experiment designed to stimulate his adrenal gland in the hopes of increasing a soldier’s ability to resist truth serums. The experiment did not go as expected, and jack fell into a coma. When he awakened however, he discovered that he was now capable of using 90% of his brain capacity, and his strength, durability and agility were increased to near-superhuman levels(Awakening). He applied for re-assignment with the Army, but they refused him. Although his condition was now stabilized, depression took hold of him and he was desperate to serve his country. At this time, Adeline became pregnant with their second child, Joseph. Unable to further his career in the military, Jack turned towards hunting. He became a world famous safari hunter and great wealth followed soon after. Adeline always suspected however that Jack felt unfulfilled.
A few years later, a group of hired mercenaries broke into the Flower’s mansion and kidnapped young Joey. Adeline attempted to fight them off, but a gas grenade prevented her from saving her son. When jack discovered what had happened, he knew he could not keep the truth from his wife any longer. Jack was not only a world famous safari hunter, he was also one of the world’s deadliest and most highly sought after assassins. He promised Adeline that he would save their son. Together, they flew to Tangiers and squared off against a rival mercenary known as the Jackal. The Jackal wanted Jack to reveal important information relating to a client or else he would have his men kill Joey. Jack gambled on the idea that he could save his son before the Jackal could give the order. Unfortunately, Joseph’s throat was slashed by one of the criminals before Jack could prevent it, destroying his vocal cords and rendering him mute. After taking Joseph to the hospital, Jack’s wife, enraged at his endangerment of her son, tried to kill Jack by shooting him, but only managed to destroy his left eye.
After Jack thwarted an assassination attempt on the President of the United States, he was subsequently framed for the murder of a U.S. Senator. The man responsible had taken on the identity of the Hound and was hunting down Flower’s friends and loved ones. Eventually with the help of Ex-CIA Director Graham Smith and the Former KGB Operative Kirov, Flower was able to prove his innocence, and the true culprit was revealed to be Dayton Guns, under the alias of the Jackal, who had again succumbed to mental instability caused by Flower.
Meanwhile, his relationship with his estranged wife Adeline took a tragic turn as Flower underwent a process to gain regeneration, allowing him to survive any wound so long as his brain is intact (this power is limited, as Flower cannot regenerate his lost eye since that injury happened before he gained his healing factor). After gaining this power, Flower was forced to give his wife a blood transfusion to save her life, resulting in her gaining a similar healing factor which manifested itself as a form of immortality. This alteration of her DNA drove Adeline semi-insane, shaming Flower into going into a semi-retirement state.
Later, Flower teamed up with Techno Viking to face his wife Adeline, who in her insane state, had revived The Q.U.E.E.N.(A weapon with anti-mage capabilities?) and sought to rid the world of all superhumans(mages), blaming them for Jericho’s death. During the battle, interrupted by Graham Smith and a band of mercenaries that he had organized from recent battles, Adeline’s right eye was destroyed. In a brief return of sanity, she begged Flower to kill her, requesting him to reunite her with "my… our children… " since her version of the healing factor wouldn’t heal the wound, but only allow her to live in spite of it. Flower refused, but Graham shocked everybody by throwing her into the Q.U.E.E.N’s reactor, reversing the alteration of her DNA and “saving” her life.
Flower has since trained his one remaining child, Rose Flower, into the mercenary business as the new Jackal, in order to find and kill all those who would try and use Q.U.E.E.N. , using a specially-designed serum to heighten her hostility and push her over the edge; unfortunately, the process also resulted in her being driven at least partially insane, to the extent that she cut out her own left eye in an attempt to prove to her father that she was just like him.