Kuai Liang/Current Timeline

"My brother participated in this folly. I do so only to face his killer!"

- Sub-Zero to Shao Kahn

Biography

 * Mortal Kombat (2011): "An assassin of the Lin Kuei clan, Kuai Liang commands the power of ice and cold. Unlike other members of his clan, he and his older brother, Bi-Han, were abducted as children by the Lin Kuei and trained in the techniques of assassination throughout their lives. Though his codename is Tundra, he has now assumed the mantle of Sub-Zero to honor his brother after Bi-Han's mysterious death. With the help of his fellow Lin Kuei Smoke, Sub-Zero tirelessly hunts the one who killed his brother."

Mortal Kombat (2011 video game)
During the first tournament, Bi-Han (elder Sub-Zero) is slain by Scorpion, despite Raiden's efforts to change Scorpion's mind. Before the events of the first tournament, Bi-Han's younger brother, Kuai Liang, was known as Tundra. During the second tournament, Tundra assumes the identity as Sub-Zero to honor his brother's death. Sub-Zero is seen with Smoke as they attempt to gather information on Bi-Han's disappearance. The two split and Sub-Zero then heads off to investigate something, when he is confronted by Cyrax. Cyrax tells him he has to come with him so he can become a cyborg, but Sub-Zero tells him that he will never comply. They fight and Sub-Zero wins.

Sub-Zero allows Cyrax to escape, intending to finish his task. He is then met by Sonya and Jax who were following Cyrax. Upon seeing him, they are confused and say that he is dead. Sub-Zero explains to them he is Bi-Han's younger brother and inquires what they know about his death. Sonya tells him he was killed by Scorpion and to check the coliseum. They are then confronted by Ermac, who causes Jax's arms to explode. After his victory, Sub-Zero tells Sonya he must go the coliseum, and directs her to a nearby portal back to Earthrealm.

Sub-Zero goes to the coliseum and demands that Shao Kahn let him fight Scorpion. Shang Tsung, however, makes him fight Reptile. Sub-Zero defeats him, and eventually, Quan Chi summons Scorpion. Sub-Zero defeats Scorpion, but before he can kill him, Lin Kuei cyborgs, led by Cyrax and Sektor, capture him. Cyrax and Sektor swear alliegence to Shao Kahn in exchange for Sub-Zero. Shao Kahn agrees and Sub-Zero is taken back to the Lin Kuei Temple to be automated.

During the Earthrealm invasion, Sub-Zero appears once more, now in his automated form as Cyber Sub-Zero. He attacks Kabal but is defeated. At Smoke's request, he is brought to Jax, who removes the slaving protocols in his CPU, giving him his free will back. He regrets all the things he did for Shao Kahn, so he joins the Earthrealm warriors, and goes to spy on Outworld. After a brief discussion, Sektor orders Sub-Zero to go on a mission with him. He informs Sub-Zero that he scanned his neural net, and knows he has been reprogrammed. Sektor ordered him to open his access panel, but he attacks him instead, starting a fight between the two, which Sektor loses.

By searching in the defeated Sektor's data banks, he discovers the location of Kano, Kintaro, and Goro. He finds the three of them in the Bell Tower torturing soldiers. After a failed attempt to get information, he freezes the three of them, and frees the soldiers. After they escape, Kintaro and Goro break free of the ice they were trapped in, leaving Sub-Zero to fight both. He does so, and emerges victorious. The freed soldiers are then pushed back by Ermac. Sub-Zero warns them to stay back, then fights and defeats him. After asking the soldiers their next location, he goes to the graveyard. The soldiers wish him good luck, another jokingly saying he didn't need it.

In the graveyard, Sub-Zero comes across Quan Chi and Noob Saibot as Chi conjures up a spell to create a Soulnado. When he confronts Noob, he discovers that Noob is his older brother. After Noob relinquishes any family ties with him, they fight, with Sub-Zero emerging victorious and claiming that he was right: they are no longer brothers. At Nightwolf's advice, he reports back to Raiden. When Raiden leaves with Liu Kang to try to talk to the Elder Gods, he is left under Nightwolf's command. Some seconds later, he detects the Lin Kuei Cyborgs, and they are ambushed. After they dispatch the Cyborgs, Sindel appears and states that she "will finish what the Lin Kuei did not". The Earthrealm warriors engage her in battle, and he, along with most of them, is killed when Sindel destroys his circuits. He is later resurrected by Quan Chi to serve him in the Netherrealm. Smoke, Jade and Cyber Sub- Zero prepare to fight Raiden, but then Raiden leaves to deal with the Emperor Shao Kahn.

Mortal Kombat X (Comic Series)
Sub-Zero debuts at the end of the first online chapter of the digital comic. Kuai Liang was revived during the Netherrealm War at a certain point during or after the war. Years later, he would receive a mission from the thunder god, Raiden, to retrieve one of the Kamidogu daggers from the crime syndicate, the Red Dragon.

Attacking the temple in Linxia, China, slaughtering the Red Dragon soldiers inside with ease. Holding the last one hostage with an ice knife at the soldier's throat, Sub-Zero makes it clear he is no longer in Quan Chi's service and demands the door be opened. When the soldier refuses, Sub-Zero simply throws him through the doors, breaking them open.

Inside the chamber, Sub-Zero sees the dagger is gone and demands to know who has it. Kuai is then attacked from behind, a lazer beam striking his mask and knocking it off, before the Black Dragon mercenary Kano gets him in a headlock, dragging the Kamidogu over Kuai's eye, scarring him. Kuai tries to tell Kano the dagger is cursed as his eyes turn red, but Kano retorts that Raiden lied to him and prepares to tell the cryomancer the truth behind the Kamidogu.

Flashbacks in chapter nine reveal Sub-Zero manages to escape Kano's grasp by slamming him into a nearby pillar, but Kano is able to stab him in the shoulder with the dagger, wounding him. As Sub-Zero collapses to his knees, Kano reveals that those cut by the Kamidogus become possessed, and only death can free them. Refusing to die again, Sub-Zero freezes and smashes Kano's optic implant, bringing the mercenary to his knees.

While Kano curses at him, Kuai Liang collects the dagger and escapes.

In Raiden's vision in chapter three, Sub-Zero is seen fighting the automated Lin Kuei.

Mortal Kombat X (2015 video game)
Kuai Liang returns in Mortal Kombat X, having been revived and restored to human form. He now leads the Lin Kuei as grandmaster, and will encounter Cassie Cage and her team in the story mode.

Ending (Sub-Zero)

 * Sub-Zero_Mortal_Kombat_2011_Ending_VideoMortal Kombat (2011) (Non-Canonical): "After the victory over Shao Kahn, Sub-Zero learned from Raiden the truth, that the Lin Kuei were ultimately responsible for the deaths of Sub-Zero's and Scorpion's families. Enraged, Sub-Zero offered Scorpion a chance to share in his quest for vengeance. With the might of fire and ice combined, they were a storm of vengeful fury as they cut down their foes. Once justice had been done, Sub-Zero and Scorpion disappeared into legend, emerging from obscurity only to avenge the innocent. The Forces of Darkness will never stop this Deadly Alliance."

Ending (Cyber Sub-Zero)

 * Mortal Kombat 9 (2011) Cyber Sub-Zero EndingMortal Kombat (2011) (Non-Canonical): "Although Sub-Zero's ending has no dialogue, it shows that after he defeats Shao Kahn he feels a certain rush overcome him. Shao Kahn's soul tortures his mind from the afterlife and inhabits his body. He upgrades his armour with motifs similar to those of the defeated emperor's. Shao Kahn lives."

Mortal Kombat (2011 video game)

 * Younger brother of the elder Sub-Zero, Bi-Han.
 * Childhood friend of Smoke.
 * He and his brother were abducted by the Lin Kuei when they were children and they were raised to serve them.
 * Sought to find Shang Tsung to learn of his brother's fate.
 * Defeated Cyrax who tried to capture him and turn him into a cyborg.
 * Informed by Sonya that Scorpion killed his brother.
 * Defeated Ermac who ripped off Jax's arms using his powers during his Mortal Kombat II story chapter, and defeated him again during his rescue plan in his Mortal Kombat III story chapter.
 * Informed Sonya on how to get Jax back to Earthrealm.
 * Demanded Shao Kahn to let him face his brother's killer, Scorpion, only to face Reptile.
 * Defeated Reptile, and then fought and defeated Scorpion, but before he could finish him off, Lin Kuei cyborgs led by Cyrax and Sektor interrupted and took him away.
 * Was automated into Cyber Sub-Zero.
 * Defeated by Kabal.
 * Regained his humanity after reprogramming by the Earthrealm warriors.
 * Worked as an undercover spy for the Earthrealm warriors.
 * Defeated Sektor after he realized Sub-Zero's soul had been restored.
 * Froze Kano, Goro, and Kintaro but later, the two Shokan broke free and challenged Sub-Zero, with him defeating them both.
 * Encountered Bi-Han, now Noob Saibot, and defeated him in combat.
 * Defeated the Lin Kuei cyborgs along with the Earthrealm warriors.
 * Killed by Sindel.
 * Resurrected by Quan Chi to serve him.

Mortal Kombat X (Comic Series)

 * Revived during the Netherrealm War.
 * Assigned by Raiden to retrieve a Kamidogu in possession of the Red Dragon.
 * Killed Red Dragon soldiers in temple where dagger was held.
 * Was attacked by Kano in the temple, receiving a scar over his right eye from the Kamidogu.
 * Became possessed by the demon corrupting the daggers.
 * Destroyed Kano's optic implant before fleeing with the dagger.