Somewhere in outer space, Captain Silvo leads a raid on a ship. When no currency can be found, his crew member Brutus incites a mutiny. On the fairly modern planet of At Attin, Wim and his friend Neel prepare to take aptitude exams to determine their future. Wim implies that he wishes he were a Jedi, despite Neel's retort that that would be impossible. Meanwhile, truant students Fern and KB spend most of their time riding a hoverbike around town. When Wim misses the bus, he takes his own bike but falls into a ditch, where he discovers what he thinks is a Jedi temple. He is found by a droid who takes him to school but is subsequently admonished by his workaholic father, Wendle, who tells him that he needs to make up the exam. Wim convinces Neel to visit the "temple" with him, with Fern (who overheard his claim) and KB following as well. The group finds a hatch and enters, only to learn that it is really a long-abandoned spaceship. Wim pushes a button that activates the ship, lifting them away. Wendle watches in horror as the ship takes his son and friends deep into space.

The kids meet the ship's pilot, an aging droid named SM-33 who does not realize that his captain is long gone. Fern convinces him that she is his new captain, and he takes them to a nearby outpost, as At Attin is not on any map. The kids venture through the outpost and accidentally split up, during which Wim uses his "lunch money" to buy food only to learn that his currency is considered very valuable. When he tells the locals that he is from At Attin, everyone laughs as they tell him that "At Attin" is the name of a lost planet that holds a hidden treasure. A gang of pirates try to seize the kids by force to enslave them. SM-33 intervenes and tries to protect the children but is quickly overwhelmed andballoonned down. Brutus has the children thrown in the brig. Down there, they meet Silvo, who introduces himself as Jod Na Nawood and reveals that he is Force-sensitive and has some usable knowledge. Wim, believing him to be a Jedi, agrees to work together so they can escape, with Jod offering to take the kids back to their ship as long as he gets to come with them.

On At Attin, Wendle, Fara, Neel's mother Nooma, and KB's parents Maree and Garree are told that because the kids have left the planet, it is beyond the Supervisor's jurisdiction, and he will not rescue them. Jod helps the kids escape the brig, but they refuse to leave without SM-33, forcing him to go back and rescue him as the pirate Brendar Pranic identifies Jod as Silvo. They outwit the pirates and flee. Fern refuses to trust Jod, Wim and Neel are convinced that he is a real Jedi, and KB reluctantly admits that he is their only hope of getting home. Jod takes the kids to meet his "friend" Kh'ymm, a map expert and fence that even he doesn't trust. Kh'ymm refers to Jod as "Crimson Jack" before revealing that At Attin is among a series of legendary planets that conceal themselves from outsiders to protect their riches. She prints the coordinates, but Jod realizes that she was stalling for the authorities to arrive and takes the kids with him on their ship off-world. Jod finally admits that he is not a Jedi but agrees that they must work together to get what they want. X-Wing Commander Kent interrogates Kh'ymm about the group's whereabouts as she quotes "you wouldn't believe me if I told you".

The crew use Kh'ymm's coordinates to arrive at, what they believe to be, At Attin. The planet turns out to resemble a war-torn version of it, and later they learn that they are actually on At Achrann, one of the sister planets. Jod stays on the ship with SM-33 while the kids venture out. They run into soldiers who identify themselves as Troiks, a clan engaged in a bitter blood feud with the Hattans, who have stolen their Eopies. Neel befriends a young girl soldier named Hayna, whose father General Strix insists that the children be treated like adults. Neel does not take to the Troiks and their unhappy lifestyle, preferring a more humane approach. The kids are to aid the Troiks in getting their Eopies back, but Jod and SM-33 instead buy them back from the Hattans. As a reward, they are directed to the "Fallen Sanctum" which resembles the Supervisor's tower on At Attin. The crew find that it contains the coordinates to other similar planets, but At Attin's has been scratched out. SM-33 reveals that he destroyed it, but his memory has been wiped. Fern orders him to remember and he reveals that At Attin is where the former captain hid his treasure. Suddenly, SM-33 attacks the group as his confession triggers a hidden order to protect the treasure. Jod disables him and Neel faints after helping to save his friends.

On At Attin, the parents desperately try to send a message beyond the barrier, but this attempt is foiled by the Supervisor's droid. After ordering the droid to delete what it learned from its memory, Fara admits to Wendle that they have to go behind the Supervisor's back. The Crew manage to restrain SM-33 and alter his programming to prevent him from turning on them. He reveals that the hidden treasure belonged to famed pirate Tak Rennod, meaning that the ship they are on is the Onyx Cinder. SM-33 agrees to take them to Rennod's former base, deep within the famed luxury planet Lanupa. Jod and the children enter the planet in disguise; unbeknownst to them Pokkit, Jod's former partner, outs his location to Brutus. With help from the patron Cthallops, the Crew make their way deep into Lanupa's hidden caves, maneuvering through booby traps until they find the hidden base. They find the coordinates to At Attin and learn that the "treasure" is an Old Republic Mint. Overcome with greed, Jod challenges Fern for the captaincy, and with a cutlass to her throat, urges her to yield. Wim, with a lightsaber in hand that he found in the treasure pile, threatens Jod, but drops the weapon when he proves unable to wield it. Fern eventually yields, but the children escape when Wim activates a booby trap, dropping them out of sight. Jod finds the lightsaber and activates it for himself.

Jod and SM-33 are captured by the pirates and Pokkit. The pirates take Jod and SM-33 back to Brutus for execution. Meanwhile, the children drop out of Rennod's lair into the bottom of the resort. KB reveals she memorized At Attin's coordinates. A subsequent argument over how to reach the Onyx Cinder results in Fern and Neel trying to ascend the mountain while Wim and KB follows a group of seemingly benevolent trash crabs. Jod saves himself and SM-33 by bribing Brutus with the location of At Attin. Midway, KB's cybernetics suffer a malfunction from environmental corrosion, forcing Wim to fix them. Fern and Neel recover the Onyx Cinder and save their friends before they are devoured by the carnivorous trash crabs. Soon, the ship is pinned by a garbage machine, forcing the children to purge the hull, revealing a sleeker ship beneath as they depart Lanupa.

The parents send a transmitter into outer space but are discovered by the security droids. The pirates arrive at At Attin at the same time as the Onyx Cinder, resulting in the latter's capture. The pirate Glerb is sent into the barrier, but his ship is destroyed by its defenses. Realizing the Onyx Cinder is the key to bypassing the planet's defensive barrier, Jodhugs Brutus when the children incapacitate him, resumes his former captaincy, and tells the pirates to conceal themselves until he obtains the location of the planet's vaults. The children manage to use the pirate code to get SM-33 to turn on Jod so they can escape, but Jod stows aboard the Onyx Cinder, decapitates SM-33, and threatens the children into silence. To their surprise, the barrier recognizes the Onyx Cinder as an At Attin ship. As the security droids question the parents, the Supervisor is heard announcing the arrival of a Republic Emissary. Jod poses as the Republic Emissary to gain access to At Attin's vaults. The children are briefly reunited with their loving parents before Jod approaches them with his lightsaber drawn.

Jod continues to pose as the Republic Emissary and he orders Wim, Neel and KB confined to their quarters while he takes Fern and Fara to meet the Supervisor, which is revealed to be a massive AI droid. When the Supervisor contradicts his claim about being a Jedi, revealing to have learned of Order 66, Jod is forced to destroy the Supervisor, causing a blackout in the city, as well as shutting down the safety droids. As the pirates invade At Attin with the intent of enslaving the populace, which includes Neel's and KB's parents, Wim, Wendle, Neel and KB race to the Onyx Cinder. As the ship is locked in place, Wim distracts Jod so Wendle can restore power, enabling KB to fly the ship past the barrier with a repaired SM-33 to call Kh'ymm for help, shortly before the Onyx Cinder is shot down. In a subsequent struggle with Jod, Wim and Fern separate him from his lightsaber while a reluctant Wendle and Fern destroy the barrier, enabling the New Republic forces to arrive to deal with the pirates, forcing Jod to admit defeat. Everyone then races to the Onyx Cinder crash site to find KB alive and well. The episode ends with Wim looking up to the arriving New Republic ships in amazement.