Percy Jackson Season 2 Episode 3 Ending: Annabeth’s Secret That Could Rewrite the Great Prophecy

Season 2 finally takes Percy and the crew off the dock and straight into the mess the books have been circling since day one. Episode 3 doesn’t just move the quest to sea, it opens the vault on the prophecy everyone’s been whispering about. The episode is called 'We Board the Princess Andromeda,' and it dropped Wednesday, December 17, 2025 on Disney+.

A cursed cruise, hold the buffet

We pick up right where Episode 2 left off: Percy, Annabeth, and Tyson chasing the Golden Fleece to fix Thalia’s poisoned tree and track down Grover. Their ride this week is the Princess Andromeda, a shiny cruise liner that looks normal until Tyson sniffs out what it actually is: a floating monster hotel.

Before things go sideways, Percy prods Annabeth about the prophecy and tells her they need a code word if the plan implodes. He picks 'boon.' Cute. Helpful. Hopefully memorable.

Then the penny drops. The ship is crawling with Laestrygonians, the same giants who tried to turn them into snacks in Episode 1, and they’re loyal to Luke Castellan. That’s confirmed when they run into Allison Simms, daughter of Apollo. She plays nice for about five minutes, but Percy clocks her from his Episode 1 dream where she and some pals were attacking Grover. Fight breaks out, Percy yanks Annabeth out of danger, and Allison goes overboard. In her stuff, the trio finds Kronos’s symbol, which is the neon sign that this whole vessel is Luke’s operation.

Percy wants to use the moment to end Luke’s run. Annabeth argues that Luke’s being used by Kronos and can still be saved. They compromise on a middle ground that somehow satisfies neither: capture Luke, don’t kill him.

Luke lays his cards on the table

They sneak into Luke’s cabin to lie in wait, but Allison is already back and ready to finish the job. Luke calls his people off and gives Percy and Annabeth the sales pitch. He shows them a sarcophagus and says the Great Awakening is underway. Translation: the Titans are coming back, and Kronos isn’t just a bedtime story anymore. Every demigod who signs up with Luke feeds Kronos’s power. His essence is clawing its way out of Tartarus, and Luke wants the Fleece to heal him up and build him a body faster.

Annabeth fires back that this is why Luke poisoned Thalia’s tree in the first place: force a Fleece quest. Luke, unbothered, says Thalia knew about the Great Prophecy and implies the gods keep everyone divided by burying the truth. He insists Percy deserves to hear it.

He then parades them through his training deck where Tyson is working with monsters, crafting something in the forge. Luke plays the 'you’ve always been an outsider' card to Tyson and promises a new golden age where everyone is free. Annabeth answers with the obvious: a Titan-Olympian war would tear the world apart. Luke shrugs off Camp Half-Blood, says it couldn’t survive an assault and anyone smart will switch sides. When Annabeth warns prophecies are famously slippery, Luke claims this one is crystal clear. Allison tires of the debate and goes for blood. Good timing on Tyson’s mystery project: the 'something' he was building is a bomb, it goes boom, and the trio bolts off the ship.

Clarisse’s side quest, sponsored by Ares

Episode 3 actually opens with Clarisse visiting the Oracle and getting a very specific set of travel instructions:

"You shall sail iron sail with warriors of bone. You shall find what you seek, and make it your own. But despair for your life... entombed within stone."

Clarisse turns down extra companions and goes solo. On her way to Thalia’s tree, she runs into dear old dad, Ares, who equips her like it’s a war campaign: an iron warship and an army of undead soldiers who still owe the gods. Subtle, he is not.

Her crew is more into feasting than functioning. She barks, nothing changes. She reframes the mission as their second chance at purpose and finally gets them in gear. Then the navigational comedy kicks in: the captain points out they’re headed to Rocktown, New Jersey, which is not exactly 'Sea of Monsters' territory. Clarisse realizes the coordinates Percy gave her are wrong. Whether that’s a screw-up or sabotage is a problem for the next episode.

The secret finally spills

After escaping the Andromeda, Annabeth drops the bomb Percy wasn’t supposed to hear yet. Chiron only ever gave her the basics, but the gist is undeniable: a child of the eldest three gods will turn 16 and become a weapon. That hero will face a single choice that either saves Olympus or wipes it out. Percy connects the dots in one breath: the gods think he could be the one to end Olympus. He flat-out wishes he didn’t know any of this.

And that, suddenly, explains a lot. Luke’s fury. Kronos’s interest. The gods playing phone-operator with half-truths.

Where everyone stands by the end

• Percy, Annabeth, and Tyson survive Luke’s ship, blow a hole in his schedule, and finally share the full stakes of the Great Prophecy.
• Luke confirms Kronos is being rebuilt piece by piece, needs the Fleece to speed up the body-forging, and is recruiting demigods to power the resurrection.
• Tyson proves invaluable in a forge and under pressure, but Luke’s 'you belong with us' pitch is out there now.
• Clarisse sails with an iron ship and an undead crew, but thanks to bad coordinates, she’s steering toward Rocktown, NJ instead of the Sea of Monsters.
• Thalia’s poisoned tree is still dying, Grover is still missing, and Kronos is getting stronger in the background. The fuse is lit.

'Percy Jackson and the Olympians' Season 2 Episodes 1-3 are now streaming on Disney+ in the US. Next week looks like fallout, course-correcting, and more of Luke’s long game coming into focus. Place your bets on who blinks first.