It's been 50 years since we last saw Samurai Jack and time has not been kind to him. Aku has destroyed every time portal and Jack has stopped aging, a side effect of time travel. It seems he is cursed to just roam the land for all eternity. His past haunts him as well as a cult of assasins dedicated to killing him for Aku's glory.
Jack's will to survive is pushed to its absolute limits after a deadly, unseen foe launches a relentless surprise attack.
Samurai Jack is gravely injured, but still decides to face one of the deadliest foes he's ever faced, Assassins from the Cult of Aku.
Jack partners with a deadly assassin in order to escape a gargantuan creature that has swallowed them whole.
Samurai Jack fights to save a group of enslaved people from being harvested as the power source for a monstrous Mega-Robot.
Ashi's search for Samurai Jack helps her to see his effect on the world after encountering numerous people and places where he has changed things for the better.
Jack and Ashi overcome a series of dangerous physical and spiritual tests in order to recover Jack's sword.
The burgeoning relationship between Jack and Ashi takes a turn after they are hunted by one of the galaxy's deadliest creatures.
Samurai Jack's worst fear is realized when he faces off against Aku; the demon makes a shocking discovery about Ashi that puts her in grave danger.
The fate of the entire universe hangs in the balance as Samurai Jack finally faces Aku.