A deadly Ninja warrior has honed his skills to fight Samurai Jack. But just as he is about to ambush him, Jack is called away to rescue a village from attacking crab monsters.
Robots that dwell in the sewers of Andromeda ask Jack to enter a giant Robot Samurai and battle Mondo Bot who terrorizes the city.
Samurai Jack is challenged to a duel by Da Samurai, who despite all his big mouth is not worthy to face Jack's blade.
During battle, Samurai Jack accidentally swallows a piece of darkness coughed up by a sickly Aku. When Aku's blackness begins to take over the Samurai, he seeks help from Master Ning.
Bounty Hunters Jo Junga the Aborigional, I & Am the infamous twins, The Gentleman & Boris the Russian have all tracked down Samurai Jack up North. Princess Mira of the Andaluvians convinces them to join forces and attack the Samurai together.
The Scotsman recognizes Samurai Jack working as a water boy on a boat and calling himself Brent Worthington. He then decides to find out why and where Jack got his memory erased by retracing his steps.
The Scotsman has saved Jack from living out the rest of his life as a water boy. Now they have to settle which one is more worthy to man the oars on the way back.
Princess Verbina and Prince Astor of the Lebidoptirans are on a quest to find their star navy to save their home world Chrystalis. But they are forced to crash land on Aku's Earth and are immediately captured by his minions. Luckily Samurai Jack is witness to the events and follows them.
After all else fails, Aku challenges Samurai Jack to a duel. To make sure of a fair fight, Jack is not allowed to use his sword while Aku must fight in human form, without minions and magic tricks.
Summer: while crossing a desert, Jack is attacked by a mirage which takes the shape of a living sand storm. Fall: an evil scientist collects fallen leaves and flowers to brew a deadly poison and put it in a well. Winter: a tribe of ogres forge the ultimate sword using fire and ice, then wage battle to determine the one destined to wield it. Spring: Jack is tempted to take a rest from his quest by a seductive wood nymph.
An experimental X-series robot was given emotions as an experiment and therefore was the only one of it's kind to survive intact. It retired after taking a shine to sweet thing Lulu, but Aku forces it to take on one more job: hunt down Samurai Jack.
A tale told in flashback concerning the childhood training of Samurai Jack in Africa. But even as part the Nubian tribe, the young prince is not safe from Aku's minions.
Samurai Jack saves a baby boy from three hungry Ogres and looks after him while searching for the child's parents.