The series kicks off with Octane discussing business with a man name Scorpulous, who tells her a story about his sea adventures and asks for her help. He describes how only a week ago his ship was damaged in a terrible storm. During the storm, their treasure hold was breached, and a very important, ornate chest plunged to the bottom of the sea. Offering a large reward, he asks if Octane is ready for such a task, to which she happily replies and shakes his fin.

At the harbor, Octane happily strides toward her ship, the Gilded Serpent; a grand galleon with a large, golden serpent adoring the bow. From atop the sails drops down Lanzo, her navigator, who is doing his daily checks. He discusses how the weather should be perfect for today and that the new sextant they purchased shouldn’t get them lost again like last time. Marlin appears, holding large, heavy stores of rum, commenting about only bringing the important stuff. As Octane chats with her crew, in the background a young squid person is seen sneaking into a crate, to which then Marlin picks up and brings to the ship’s hold.

As they’re sailing, wanting to refresh themselves, Lanzo heads to the hold for rum and discovers Dux eating their oranges. Grabbing them by the arm, he brings them up to scold them and tells Octane of the thief aboard. They plead with Octane, informing them they aren’t a thief but instead are a pirate just like them, to which Octane sees right through. As they discuss, a cannonball flies past Octane and nearly hits her. Looking back, they see a band of rival pirates chasing in a galleon the same size as theirs. They proclaim they’re gonna get the treasure first and keep it for themselves.

The Gilded Serpent’s crew goes to battle stations, locking Dux in the captain’s quarters to keep them out of the way. During the battle Octane, Marlin, and Lanzo are seen fighting various pirates that board the ship with their swords. As they’re fighting, Dux breaks out of their room and starts climbing the mass. As Octane is fighting, she’s about to be overwhelmed when a large bag of sand clobbers the opponent thanks to Dux dropping it on them. They gain the upper hand and force the pirates to retreat, going to reclaim the treasure with a large, mounted fishing rod.

Returning to harbor they are given a big reward, Scorpulous asking if they had any trouble to which they reply, “Just another day!” Looking at Dux, they scold them for boarding the ship, but also recognize they have nowhere else to go and their ambition reminds Octane of their younger self. They agree to let them stay, much to Lanzo’s visible dismay.

While docked at the harbor, Octane is approached by a messenger who gives her a letter. It's an invitation to a large, prestigious mansion in the underside of Cala Mori. She travels with her crew, and Dux to meet the baron of wealth all while discussing the things they’re gonna buy with his money. When they get there, they’re greeted by Lucius Largemouth. He tells them of a rare, giant sea squid he wishes to rescue but doesn’t have the means to do so. He’s heard of their adventures and exploits and wants to hire them for a hefty sum.

Agreeing to rescue it, they sail off to the reef where it is supposed to be located. When they arrive, they put on their diving armor and descend down below to the murky depths. Along the way, the darkness becomes great but Lanzo is able to help light the way. They hold onto a guiding rope they attached to the ship so as to not lose their orientation.

Reaching the ocean floor, they come across other parts of ships and harpoons stuck in the ground, noticing some of the pieces have the rich man’s insignia on them. Eventually they come across the giant squid, resting. As they’re about to tie a rope to it and net it, it speaks to them and tells them who they are. It is revealed the squid is named Titanica and is the last of their kind. Many were sent here before Octane and her crew, and they all failed due as he was able to swim away just in time but this time he’s too exhausted to flee. The crew finally understands the rich man didn’t want to rescue the squid, instead he was trying to trick them into bringing it to him so he could have it as a trophy.

The crew acknowledge this and give the squid its farewell. Back at the mansion, they lie to the rich man and tell that the squid wasn’t there and there were just remains, convincing him that the squid wasn’t worth pursuing anymore.

While out on a voyage, Lanzo comes across a strange, star shaped object. He boasts and brags about its strange, unknown origins and that this unique treasure is his to keep since he found it. Not wanting to start another argument, Octane lets him have it and they head back to the harbor to rest.

At the Shady Shell Tavern, while ordering drinks, Lanzo admires his keepsake when a shifty eyed sailor comes to him and tells him it's better off deep underwater where no one can touch it. He regales him with tales of curses and misfortune, telling him that the trinket will give him unimaginable luck and he’ll win at everything, but at the cost of his sanity. Lanzo tells him off, remarking that his spooky stories are just fiction. When Marlin invites him to a game of chance, Lanzo finds himself constantly winning any and all bets, no matter the odds. Realizing the sailor was right, he ignores the warning and uses it to gain the upper hand in everything he does.

The next day, Lanzo is seen going around town and hustling people, going mad with the amount of money and prizes he’s winning. He begins locking himself in his room, surrounded by his treasure hoard. When Octane, Marlin, and Dux begin to notice this, they try to talk to him only for him to rebel at their concerns. Unable to continue, they go and seek out the sailor, who they find passed out on a bench in front of the tavern. Waking him up, he reveals the only way to counter the curse is to throw the star back to the bottom of the sea. Unsure how to make Lanzo give it up, they come up with a plan.

That evening, the sailor goes to Lanzo and challenges him to a diving contest to the harbor’s ocean floor. The loser has to give the winner everything they own, bank and all. Lanzo, knowing he’ll win, agrees and they go to dive. The two are rigged to ropes, so they can be pulled back up when the game is over. As they swim to the bottom Lanzo is about to win when Marlin appears and sucker punches him, causing the star to float away over a shelf and into the deep dark. Lanzo is then pulled up quickly by Octane and Dux, who watch him flail about over his loss.

The next morning, Lanzo emerges from his room tired but cured of his curse. He thanks the sailor for helping him, saying he should’ve heeded his warning. Marlin apologizes for the punch, saying it was the only way, to which Lanzo punches him back and they laugh.

After a giant sea storm visits the harbor, the crew get ready for their next adventure to the Isle of Alcovia where they are to rendezvous with someone for a delivery. On the way, Marlin remarks how weird the storm was, saying he saw seaweed and all manner of things thrown about the harbor. Lanzo laughs, saying that Marlin mustn’t get out much, since seafloor debris is often swept up by the powerful winds. Dux, fascinated by this, asks Lanzo what else can a sea storm bring up. He plays along, joking about whole flying ships being brought up and thrown by the winds.

As they’re arriving, and Lanzo continues his fiction, he remarks that “just about anything can come up from a sea storm” to which Dux says “that explains all the jellyfish!” When the crew looks to the island, they see it completely covered in dangerous, red-spotted jellyfish. At the harbor, a sailor carefully goes to bring them in and tells them they must be careful. All around the townspeople are carefully navigating as cleanup crews unsuccessfully attempt to move the jellyfish with equipment; they simply won’t budge.

They head to the rendezvous point and meet Sirenia, a female musician who receives the package, opens it and is happy to see a new, single string for her instrument. Lanzo is upset they wasted all this time for a single string, but Octane comments that they were paid well so it doesn’t matter.

Ecstatic by the delivery, Sirenia invites them into their home, which is jellyfish free for some reason. As they enter, they’re offered drinks and nourishment by Merinda, Sirenia’s wife. Dux is fascinated by all the instruments in their house, attempting to play them without permission. Merinda lets him say, commenting that everyone should learn to play a song or two. Octane boasts about her ability to sing sea shanties, to which her, Marlin, and Lanzo break into song. Merinda and Sirenia, amused by this, play along with their instruments as Dux bangs cymbals together.

As the merriment dies down, Octane remarks that their house is jellyfish free. Merinda comments that it seems the jellyfish don’t like loud noises and since they play music all day they mustn’t be attracted to their domain. Working with this idea, the crew comes up with a plan to rid the jellyfish. They begin singing sea shanties loudly and playing instruments, Dux following along with hap hazard drum and cymbal slamming.

As they travel back to the harbor, the jellyfish begin moving en masse back into the ocean, throwing themselves into the waters. Reaching their ship, Sirenia and Merinda comment that they’re welcome back anytime to sing songs and have fun.

Resting at the harbor, Octane talks to Dux about where they see themselves in the future. Dux remarks about wanting to be a great pirate just like them, or even better. Laughing together, Lanzo enters with a grimace and tells Octane they need to start preparing for their next mission. Marlin interrupts, informing them that there’s no job today. Excited by this prospect, Octane jumps up and announces they’re going on vacation.

Sailing for themselves this time and not for coin, they head toward Blissful Boards, a large amalgam of shipwrecks that’s been turned into a small town with amusement rides and amenities. Dux decides he wants to go with Octane to ride the great sea eels. Octane and Dux ride on the eels and go underwater for awhile, leaving Marlin and Lanzo to wait by the shore. Marlin notices a strange ship docking next to theirs and asks Lanzo if it looks familiar, to which he comments that it looks like a ship belonging to the Council. As Octane and Dux surface, they’re informed that they should go immediately when they’re given the news. Dux, not understanding the problem, runs off to go find more fun stuff to do.

Chasing after Dux, they see a strange man talking to people and holding up a poster of the Gilded Serpent crew. As the people being talked to point to them, they realize they’ve been found by Kamorek; a mercenary known to hunt pirates. They continue to chase after Dux, with Kamorek behind. As they chase, a large man named Tank stops them and a battle ensues. Dueling with their swords, they distract the law bringers long enough for Octane to find Dux and escape back to their ship. As they sail away, Kamorek gives chase in his ship, the Justice’s Jewel.

Wanting to lose them, Octane makes the bold decision to cut through the Razor’s Reef, a dangerous isle of sharp rocks. Navigating skillfully, they manage to lose Kamorek and find themselves back at the harbor in Cala Mori where they rest. Dux asks who they were, to which Octane informs him and tells him they must always avoid them.

While out on a mission to deliver goods to the Sizzling Sandbar, the crew is taken by surprise by Kamorek and a small fleet of hired hands. Octane and the crew do their best to battle, but Kamorek boards the ship. Seeing he cannot win at the moment; he kidnaps Dux and guarantees harm unless Octane surrenders. They take them back to their ship and leave, yelling to Octane that they will meet at the Fisherman’s Fortress.

Knowing it’ll be a trap; Octane organizes a plan with Lanzo and Marlin. Octane will go meet Kamorek, while the other two go and find Dux.

Back on Kamorek’s ship, Tank is visibly distraught that Kamorek would bring a child into their hold and reprimands him, saying it's insane and horrible. Kamorek reminds him of who writes his checks and tells him off. Amelia, a vagrant that Kamorek recently rescued, goes to Dux to comfort him. 

At the fortress, Octane and her crew are held captive as they enter. Octane is released, told to follow Kamorek through the halls as he explains everything. Kamorek reveals his motives; to rid the world of people like Octane. He says he doesn’t want to hurt Dux but realizes Dux has been poisoned by Octane and therefore is as much of a pirate as them. However, it’s not too late to “save their soul” and if Octane surrenders themselves and her crew, he’ll let Dux go. Otherwise, he’ll have to put them all away forever, be it in a prison or a watery grave.

Meanwhile, Marlin and Lanzo break their restraints and sneak into the heart of the fortress where they find Dux, who is safe. As they go to knock out the remaining guards, they come across Amelia who pleads to be untouched, to which they agree. She shows them where Dux is being held and they free him. As they’re escaping, they get caught by a searchlight and the whole fortress goes on alert.

As the alarm blares, Kamorek commands Tank to kill Octane, to which he draws his sword and they begin to fight. As they’re fighting, Tank overpowers her easily and is about to kill her when Marlin and Lanzo appear with Dux. 

The image of seeing his opponent on the ground and about to be killed juxtaposed with Dux watching causes him to have a flashback. In Octane's position is a dying man in uniform and in Dux position is a crying child, begging and pleading for their fathers life. Stuck in his phase, Octane hits the sword out of his hand and kicks him back, freeing herself.

They manage to make it to their ship where they escape. Kamorek berates Tank, threatening him, while Amelia watches on as the boat sails away to safer waters.