Samurai Jack - Season 4 (2003)

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.

As Jack goes through fall, winter, spring and summer, he must battle the perils that each season brings.

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.