"Team Isberto: Demongo's Revenge"
In this story, Aku's old powerful henchman Demongo is introduced. It begins with a flashback to when Aku sent Demongo to destroy Samurai Jack. During the battle, Demongo summons his army of undead warriors and attacks Jack. After Jack frees his essence, Demongo becomes weak and Jack defeated him. Returning to Aku's lair, Demongo failed him for his own defeat. Therefore, Aku killed him and Demongo was remained in the shadow realm. More than twenty years later, Ian Isberto, Samurai Jack, and Rikaton defeated Aku after the last battle. Despite showing no compassion towards his minion, Demongo takes his Undead Soldiers - Abomination, Wight, and Banshee to Earth. He plans to kill Ian, who is responsible for helping Jack defeated Aku, in order to reclaim his master's death. His forces ambush Ian and his friends on a camping trip, and Ian is wounded when he takes a blast from Demongo that was intended for Buttercup.
After tauheed sets up a shelter in a cave with Ian Isberto, Buttercup flies off to obtain Senzu beans from Jayson. After obtaining the beans, she is ambushed by Demongo's henchmen, but is saved by Samurai Jack. Jack dispatches Abomination and Wight, and takes on Banshee, easily gaining the upper hand. During the battle, Demongo arrives and catches Jack off-guard with a powerful energy beam, which impales him through the chest but does not kill him. Demongo then sends Banshee after Buttercup as he continues to blast Jack. Buttercup gets to the cave with the Senzu beans, but Banshee destroys them. However, he heals Ian with a spare bean Yajirobe gave him earlier. After Banshee beats down Dexter, Cyborg, and Buttercup, Ian appears fully healed. Demongo shows up, holding onto an unconscious Jack. He then blasts his body with an unexpected attack as Ian watches in horror. Ian shoots Banshee into the distance, and begins to fight Demongo.
After Ian Isberto proves to be a worthy opponent, Demongo tells of his history with Aku. He then reveals his final transformation, and pummels Ian around effortlessly, despite Ian using his Sapphire Sword. Demongo then proceeds to destroy the landscape. However, after seeing a bird die from wounds inflicted by damage caused during the struggle, Ian thinks back on his friends and family, how they all would be killed if he let Demongo kill him. He then picks up the dead bird, letting out a yell so powerful it cracks solid stone. Ian then transforms into his powered armor suit as the Falcon Trigger, and gives enough of his sword's energy to revive the bird. Demongo then finds himself, like Aku was, grossly outclassed. After attempting to punch and blast the Falcon Trigger with no effect, Demongo summons a skull when he powers up an enormous ball of energy. Demongo launches the attack with hopes to destroy Ian and the Earth along with him. After a stint of struggling, Ian eventually manages to send it back with the Sapphire Falcon Blast, forcing Demongo off the Earth, towards the sun. As he hits the sun's surface, Demongo recounts back when he is not stronger than Samurai Jack, regretting his action and realizes that Aku is not the only immortal god but he is too. The sun then seemingly disintegrates his body.
Dexter, Cyborg, and Buttercup find Ian Isberto, drained after his battle. They are looking for Samurai Jack when Banshee reappears, and prepares to kill them all. However, before she can attack, she is killed by Jack's sword from a distance. Buttercup looks around for Jack, and the story ends with Jack gazing skyward.
The End