"Scorpion" was the code name of one of the Shirai Ryu's finest warriors - a ninja assassin named Hanzo Hasashi. It is also known that his father, a former member of the Shirai Ryu, forbade his son from joining the clan, as he did not wish his son to live the life of an assassin. However, Hanzo joined in spite of his father's wishes in order to provide his wife and son with a comfortable life. During the events of Mortal Kombat Mythologies: Sub-Zero, he was hired by Quan Chi to find a map hidden in the Himalayas. However, Quan Chi had also requested for the services of Sub-Zero the elder, who belonged to the rival Lin Kuei clan and was Scorpion's personal rival. The theory of hiring two ninja was simple - in case one of them failed, the other would succeed and Quan Chi would be closer to unlocking unknown and ultimate power.
Both Scorpion and Sub-Zero succeeded in getting to their destination, but the two met each other reaching for the same map they were sent out to acquire. The two rival warriors fought, with Sub-Zero gaining the advantage. As Scorpion lay on the ground defeated, Sub-Zero decapitated him and left his corpse where it fell. Scorpion's soul would fall into the pits of the Netherealm itself; there he had to choose whether to remain in the bowels of Hell for the rest of the eternity, or to return to the world of the living as a spectre, but losing any memory from his past and his family. Obsessed with revenge, he became a ninja spectre. Scorpion learned that the Lin Kuei, following his death, had also massacred his entire clan and family. Fueled by an undying rage and thirst for retribution, he vowed to kill Sub-Zero in retaliation for his own murder.
Scorpion, as depicted in John Tobias' comic
Scorpion, as depicted in John Tobias' comic
Scorpion would not meet Sub-Zero again until a brief encounter in the Netherealm, where Sub-Zero had been sent by Raiden to regain the amulet from Shinnok and Quan Chi. The two fought, but Sub-Zero defeated Scorpion again and escaped the undead assassin's wrath. Following his return to Earth, Sub-Zero was later invited to participate in Shang Tsung's tournament of Mortal Kombat - unknown to the Lin Kuei warrior, Scorpion had been invited as well. The two met on Shang Tsung's boat, at which point Scorpion grabbed Sub-Zero by the throat and said "You killed me in cold blood exactly two years ago, to this day, but my demons have allowed me to avenge my death. I could kill you at this moment, but I am not a murderer. We will meet at the tournament, and then, Lin Kuei warrior, you will pay with your life."
While Scorpion and Sub-Zero did not meet during the actual tournament, they did meet in the closing moments of Mortal Kombat, and true to his word the hell-bent spectre fought Sub-Zero in another fight to the death. Proving to be too strong and powerful for the Lin Kuei warrior, Scorpion slew his nemesis and avenged his death. With that, he violently burst into flames and ash, returning to the Netherealm.
A year later, Scorpion learned of Sub-Zero's plans to compete in the second tournament. Enraged at the idea that his murderer had somehow returned and his vengeance was incomplete, Scorpion followed Sub-Zero into the realm of Outworld, where Shao Kahn hosted the second tournament. It is unknown whether or not Sub-Zero and Scorpion met, but Scorpion was a witness to one of Sub-Zero's battles, in which he saw Sub-Zero sparing the life of an opponent. Scorpion did not understand why the Lin Kuei warrior had grown so merciful. He later came to the realization that this Sub-Zero was the younger brother of his murderer, who was sent to complete his brother's failed mission. Scorpion then vowed not to harm this new Sub-Zero, as it was not the man who once killed him. He also vowed to be this new Sub-Zero's guardian in atonement for killing his older brother who had become Noob Saibot. Scorpion was then summoned back to the damnation of the Netherealm.
When Shao Kahn invaded Earthrealm and unsuccessfully tried to conquer the Netherealm as well, Scorpion was inadvertently set free, and began walking the Earth once more. He pledged allegiance to no one, taking neither friends nor enemies. Shao Khan, however, recognized Scorpion's superior warrior skills, and enlisted the ninja in his forces. Scorpion's allegiance with Shao Kahn quickly dissolved when he discovered that Sub-Zero, whom he had vowed not to harm, was one of Earth's Chosen warriors and a target of Shao Kahn's. He turned on Shao Kahn, and sided with the Earthrealm warriors in their final showdown with the evil emperor. With Shao Khan and his minions defeated, Earth reverted back to normal, causing Scorpion to return to the Netherealm once more.
During the events of Mortal Kombat Gold, Scorpion came to believe that the younger Sub-Zero was also involved with the murders of his family and clan. Quan Chi offered him life in exchange for the spectre's assistance in the war with the Elder Gods, which Scorpion accepted, but only so he could face Sub-Zero in combat- which Quan Chi was not only fully aware of, but had planned on all along. Scorpion eventually caught up with Sub-Zero, and the two began their final battle; as with the elder Sub-Zero, Scorpion's obsession for revenge was too strong and he emerged the victor. As Scorpion stood triumphantly over Sub-Zero, the defeated warrior proclaiming innocence, Quan Chi appeared and revealed that he had arranged for the killing of the Shirai Ryu and Scorpion's family. Before Scorpion could speak, Quan Chi attempted to send him back to the Netherealm. Scorpion grabbed Quan Chi before the sorcerer could complete his spell, sending them both into the dreaded realm.
During the years that Quan Chi spent trapped in the fifth plane of the Netherealm, he would be chased, brutalized, and tortured by Scorpion. Quan Chi had little chance of escape, as his powers were weakened while he was in the Netherealm, and Scorpion's power and strength conversely increased (note: Quan Chi, as Shinnok's second-in-command, had previously resided in the Netherealm. However, this was explained as a new region of the Netherealm where sorcerers retain their power). Quan Chi eventually struck a deal with the Oni Drahmin and Moloch, who fought off Scorpion for him. When Quan Chi escaped the Netherealm through a portal, Scorpion followed him, but the volatile portal did not send him to the same place. He continued to hound Quan Chi in a game of cat-and-mouse until he found himself ambushed by Drahmin and Moloch, who had also escaped the Netherealm. They threw him into the Soulnado, believing that it would kill the ninja spectre once and for all (as recounted in Mortal Kombat: Deadly Alliance).
Scorpion, however, managed to escape into the Void before the purity of the soulnado tore him apart. While in the Void, he met the Elder Gods, in whom he had never believed, and forever became changed from what he saw. He also witnessed Raiden's sacrifice and Onaga's dominance beginning to unfold. The Elder Gods were aware of his presence and enhanced his mortal and supernatural abilities, making him the Champion of the Elder Gods. The Elder Gods gave him a new mission, to seek and destroy Onaga before he unmade the realms. Scorpion emerged from the Void and returned to Outworld.
In Armageddon's Konquest mode, Scorpion appears to be no longer willing to serve as the Elder Gods' champion. This is due to the bargain he had made with the Elder Gods to serve them in the first place; they would resurrect the Shirai Ryu clan in return for his services. While the Elder Gods did fulfill their promise, they brought back the Shirai Ryu clan as hellspawned warriors, the same as Scorpion. Enraged at what he perceived as their betrayal, Scorpion vows to gain vengeance on the Elder Gods by removing the two things crucial to their plans- Taven and Daegon. They were the Elder Gods' only means to prevent Armageddon.
In Scorpion's Mortal Kombat: Armageddon ending after defeating Blaze , the entire Shirai Ryu clan is resurrected, thousands of them crowding the pyramid below, awaiting his command, along with Scorpion's wife and son. Then the sorcerer Quan Chi appears and kidnaps his son, taking him into the Netherealm through a portal. Enraged, Scorpion commands the Shirai Ryu to find Quan Chi; Scorpion will not rest until his son is rescued and the sorcerer has been destroyed.