Samukai

Samukai was a major antagonist in the pilot episodes of LEGO Ninjago: Masters of Spinjitzu. A fearsome Skulkin General with four arms, he was the King of the Underworld until Lord Garmadon usurped his title. Nonetheless, Samukai retained a position high on the Underworld hierarchy as Garmadon's lieutenant and the Skulkin General of Fire, carrying out his superior's will while secretly plotting to retake his throne.

Usurpation
Samukai was once the King of the Underworld until Garmadon was banished to the Underworld after losing to a fight with his brother Sensei Wu. Samukai, addressing his authority, attempts to subject Garmadon to a lifetime of pain and suffering for his wrongdoings, but Garmadon used Spinjitzu to engage into a fight with Samukai. After the duel ends with Garmadon finally defeating Samukai, Garmadon then took Samukai's helmet for himself, dubbing himself as the new King of the Underworld, much to Samukai's discomfort. Samukai then became relegated as the Skulkin General of Fire. At some point, Samukai later finds Dr. Julien and requests him to make monstrous war machines for the Skulkin army, threatening that if he wouldn't do what he was told to do, he would never see his son ever again.

Assault on Four Weapons Blacksmith Shop
Years later, he lead an assault on the Four Weapons Blacksmith shop to find the map to the four Golden Weapons. He fought Kai one on one for a small amount of time before subduing him, but before he could finish him off, Sensei Wu intervened. Samukai then used his daggers to make a large water tower begin to fall on Kai, leaving Sensei Wu with a choice: Rescue Kai, or capture Samukai. Samukai used the distraction to capture Nya and escape in his Skull Truck.

Seeking the Golden Weapons
He then went to find the first Golden Weapon, the Scythe of Quakes, hidden in the Caves of Despair. However, Nuckal read the map upside down, and was digging in the wrong place. After the four Ninja accidentally gave away their presence, he took his army in to fight them and claim the Golden Weapon. Soon after the Ninja discovered Spinjitzu during the battle, he called a retreat, as he was not prepared to fight four Spinjitzu masters. Garmadon then gave Samukai new orders: Let the Ninja think they're winning. Samukai continued to seek the Golden Weapons, but allowed the Ninja to dominate until just before they began to search for the Sword of Fire. Then, Garmadon's scheme came into play. Kai was lured away from the rest of the group, and Sensei Wu followed. Samukai and his army then ambushed Jay, Zane and Cole, claiming the Shurikens of Ice, the Scythe of Quakes, and the Nunchucks of Lightning for Garmadon.

Betrayal To Lord Garmadon
Garmadon then sent him back to the Underworld, where he fought Sensei Wu, who was wielding the Sword of Fire. Samukai defeated him, and took up the Sword, intending to use the Four Weapons and their power to defeat Garmadon and regain control of the Underworld. However, the power of the Four Weapons united was too much for anyone to handle, and as a result, Samukai disintegrates and a Portal through space and time appears, which was Garmadon's true plan all along. Having succeeded in his plan, Garmadon then escapes through the Portal vowing to return with more power so that he can wield the Four Weapons and recreate Ninjago in his own image.

Appearance
Samukai had four arms and a large head. He also had two scars above his eyes, and wore the standard chest plate of a fire-based General of the Skeleton Army. He once wore the helmet Lord Garmadon wore in 2011, as it seems this helmet goes to the ruler of the Underworld.

Weapons
In battle, Samukai generally wielded four daggers with small skulls on the hilts. Apart from general melee combat, he could also twirl the blades in his hands, enhancing their cutting power, or throw them with impressive accuracy at enemies or objects.

After attacking the Ninja in the Forest of Tranquility, Samukai gained three of the four Golden Weapons; the Scythe of Quakes, the Shurikens of Ice, and the Nunchucks of Lightning. He used them all to great effect against Sensei Wu, overwhelming him with the combined elements of ice, lightning, and earth.

However, when he picked up the Sword of Fire and attempted to use all four Golden Weapons against Lord Garmadon, he was destroyed, as their combined power would overwhelm anyone apart from the First Spinjitzu Master. In fact, Lord Garmadon had counted on Samukai's betrayal giving him the means of making himself powerful enough to possess all four Golden Weapons at once.

Trivia

 * Samukai's name is a pun on of the word "Samurai."
 * His appearance and role in the series are reminiscent of General Grievous (from Star Wars). Notably, both Samukai and Grievous are four-armed generals who are predominantly white in coloration and who act as the second-in-command of the evil forces. In "Way of the Ninja", Samukai even uses a similar technique to General Grievous, rapidly spinning his weapons in his hands to act as shields and saws.
 * Samukai is the only Skulkin that doesn't have a spinner/Character Card. It may be due to his unique minifigure making the spinner more or less stable (a problem that would later prevent the Serpentine Generals from appearing in spinner sets), or because his four arms would give players more options on weapon placement, making Samukai a potential game-breaker against other, "normal" characters.