Mad Jack

"I am the son of Aku's magic. He has looked deep within you and has spawned me from your own burning hatred. I am your dark side, and I possess all the powers that you wield. And I have only one purpose in my existence: to destroy you!"

- Mad Jack

"EARN!??? After everything we've done, everything WE'VE BEEN THROUGH? The death, the loss, THE SUFFERING! WHO ARE YOU TO DENY US WHAT IS RIGHTFULLY OURS!?""

- Mad Jack

Mad Jack was the embodiment of Jack's inner negative emotions, temporarily given form by Aku to defeat him using his own skills against him. He made his first appearance in Episode VIII: Jack versus Mad Jack. He lost his physical form after Jack found inner peace and caused Mad Jack to cease. When Aku destroyed the last remaining time portal, Jack's rage brought Mad Jack to resurface again as Inner Jack, where he continued to plague Jack's psyche for most of Season 5 until he found inner peace once more in Episode XCVIII, this time bringing about his end permanently.

Personality
Mad Jack was created by Aku to see if he could defeat Samurai Jack using his own skills against him. He has shown to be very rude, violent, and rather psychopathic, completely unlike Jack. In essence, he was the physical embodiment of all of Jack's rage and frustration.

By season 5, Mad Jack becomes more short-tempered, egotistical, and violent than his real counterpart. Often citing himself as the reason for Jack's continued survival since losing the sword, he tries to convince Jack of their shared weariness for 50 aimless years and manifests other negative personalities to misguide Jack to taking the wrong path.

Appearance
He is Jack's exact replica, except that his robe is black with red trim, his skin is paler, and his eyes are blood red with shadows under them. Like Jack, Mad Jack was also armed with a katana similar to Jack's sword. In Season 5, he takes form in a more demonic and distorted version of Jack.

Biography
Aku had sent several bounty hunters to attack Jack, all of which failed, Aku lamented that no fighting style seemed to be able to beat Jack's, which caused him to form a plan; to pit him against himself.

After having to fight several bounty hunters, Jack became infuriated at his lack of peace and he was tired of fighting. He tried to calm down after defeating the last of them, but when his sandal strap broke, he snapped and threw the sandal at one of his wanted screens. The screen then started to light up, energy came from it and formed around the sandal, sealing the strap, until it finally forming into a more sinister Jack, Mad Jack. Surprised Jack questioned who the double was. In response, Mad Jack revealed himself to be the spawn of Aku's magic, formed from Jack's own hatred as well as being his dark side possessing all of his skills, created for the sole purpose to destroy Jack for Aku.

The two fighters then begin the battle and appear to be evenly matched, trading blow for blow. However, since they both possess equal skills, neither one could best the other. Their fight grew more intense as they continued, forcing each other's hair to sprawl out, reducing trees to ashes with the sparks of their swords, and outright destroying the area with the force of their blows.

As Jack struggled with his dark half, he saw the reflection of his own eyes in his sword and to his horror saw they bore a great resemblance. Finding his peaceful center, Jack stepped back and calmed himself, causing all of his negative emotions to fade away. He then claimed the fight was over, stating that the negative emotions that formed Mad Jack were gone, meaning Mad Jack didn't exist.

Refusing to let Jack look down on him, Mad Jack boasted that he was real and charged toward Jack to deliver the final blow. However, Jack remained in a meditative position, not even bothering to defend. As he was about to strike Jack down, Mad Jack was instantly in Jack's control, able to do nothing except scream in impotent fury and defeat before he was sealed away by Jack.

Shadow of Aku
Towards the end of Shadow of Aku, Aku's magic gives Mad Jack life once more, and Jack fights him on a platform high up on a futuristic tower. Jack is forced to defeat him in combat multiple times, with each defeat causing his essence to flow into a hovering black device nearby, causing Mad Jack's face to show up on its monitor. Jack destroys enough of the devices to stop him for good, causing the floor under Jack to shatter, which sends him plummeting to the final boss battle with Aku.

Season 5
At some point, Mad Jack was the reason Samurai Jack loses his katana. As Aku destroyed the final time portal, Jack's frustration began to surface which, unknown to Aku, broke the inner peace Jack had over his darker side and caused Jack to angrily lash out at Aku. Aku took advantage of Jack's newfound rage by transforming several innocent goats with magic which Jack killed in cold blood, stunning the samurai but allowing him to come back to his senses. As soon as a large slab hit Jack, the katana fell into the pit and was never seen again.

Mad Jack would continue to torment Jack mentally by manifesting in the other negative personalities to continuously provoke him into giving up on his quest, citing the loss of their sword as proof of their failure and dishonor to their ancestors.

When Jack tried to make a perfect tea but failed, Mad Jack manifests himself once again frustrated at the monk for not telling the location of the Katana. But Mad Jack's attempts at interrogating the Monk are met with Jack confronting him about being the reason why he lost the sword, to which Mad Jack defends himself by claiming he's the reason why they are alive. As he attacks Jack, Jack calmly controls his anger and frustration and finally sees through his rage and hate, sealing Mad Jack for good as the latter begs "You need me". After sealing his inner demon, Jack finally reclaims the Katana.

Since he was Aku's creation, it is likely that he ceased to be after the past Aku's destruction.

Abilities
Becoming temporarily manifested by Aku's magic, Mad Jack's physical abilities and combat skills are identical to Jack's own. This resulted in a perfect stalemate between him and Jack when the two of them fought. However, he could only exist so long as Jack's hatred existed. Whenever Jack can achieve balance with his emotional state, Mad Jack ceases to be.

Appearances
Season 1 Video Game Season 5
 * Episode VIII: Jack versus Mad Jack (debut appearance)
 * The Shadow of Aku
 * Episode XCVIII (permanently sealed by Jack and final appearance)

Quotes
Episode VIII
 * "Don't be such a fool, I'm you [...] Ugh, you're so stupid. You are you also"
 * "I am the son of Aku's magic, he has looked deep within you and has spawned me from your own burning hatred, I am your dark side and I possess all the powers that you wield, And I only have one purpose in my existence. To destroy you"
 * "Hurts, doesn't it?"
 * "Huh? What the?"
 * "What the heck is going on?"
 * "WHAT?!"
 * "FOOL! I am real. Now feel the reality of my cold hard steel"

Samurai Jack: The Shadow of Aku
 * "That's right! It's me again! Your other self! Your angry self! The one you keep locked away inside you! Aku has given me life once more! Don't think you can defeat me so easily this time!"

Season 5
 * "That's fortune cookie nonsense. He know where it is, he just won't tell you."
 * "EARN!??? After everything we've done, everything WE'VE BEEN THROUGH? The death, the loss, THE SUFFERING! WHO ARE YOU TO DENY US WHAT IS RIGHTFULLY OURS!?"
 * "I HAVE KEPT US ALIVE! He's the one who has taken it from us! HE KNOWS WHERE IT IS!"
 * "You're in my way!"
 * "YOU'RE A FOOL!!!"
 * (Mad Jack's final words): "YOU NEED ME!!!!!"

Trivia

 * In Cartoon Network: Punch Time Explosion, he appeared as a skin for Samurai Jack when changing Jack's appearance.
 * Mad Jack is Jack's inner demon personified; Sometimes one of the strongest enemies you can face is the battle with yourself.
 * Mad Jack's return in Episode XCVIII portrays him in a red spirit form; This is because as Jack was sealing him during their first encounter, he was sealed into a red spirit form, therefore destroying his physical form.
 * Many confuse Mad Jack to be Anguish, Bloodlust & Apathy in Episodes XCVIII, XCIV, and XCV, when they are all separate beings. This is evidenced as Mad Jack has stated that he was "spawned from [Jack's] own burning hatred" whereas the other personalities show different and calmer reactions. Anguish shows emotions of weariness and lost hope (emotions of sadness that Mad Jack cannot attain due to his burning anger), Bloodlust is more manipulative than violent (unlike Mad Jack whose anger is everlasting), and Apathy tries to reason with Jack with a very calmer tone (which Mad Jack cannot do as he is rage personified).
 * Mad Jack is defeated both in Season 1 and Season 5 by being sealed after Jack finds inner peace within himself.