Who is Alison Simms in Percy Jackson and the Olympians Season 2? Luke’s new ally from Episode 3, explained

Percy Jackson and the Olympians Season 2 Episode 3 is titled We Board the Princess Andromeda. It premiered on Disney+ on December 17, 2025. Season 2 dropped on December 10, 2025.

In this third episode of Percy Jackson and the Olympians, Percy, Annabeth, and Tyson find themselves on the Princess Andromeda cruise ship. They have to face monsters, betrayals from unexpected places, and get dangerously close to Luke Castellan’s swelling army. The trio starts to see just how far Kronos’ shadow stretches, and it’s clear that a lot of old friends have turned into enemies.

Alison Simms is one of the biggest surprises in Percy Jackson and the Olympians Season 2 Episode 3. At first, she appears to be simply another pleasant character. However, it turns out that she is a major supporter of Luke. The role of Alison is played by Beatrice Kitsos, and her character is scary for one main reason: she was a camper at Camp Half-Blood during her childhood, but now she is a part of Kronos and the Titan army.

Her defection makes you question how many more demigods have turned to Luke’s side in Percy Jackson and the Olympians? What is loyalty worth in this instance? Identifying Alison’s role and values is vital to seeing the extent of trouble Percy and his gang are caught in.

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Alison Simms in Percy Jackson and the Olympians

Alison Simms isn’t in Rick Riordan’s The Sea of Monsters. She is a new character made just for the Disney+ Percy Jackson and the Olympians. Her story makes it clear that Luke’s rebellion goes way beyond monsters or twisted prophecies. He has managed to win over real demigods, kids who actually trained at Camp Half-Blood. They have turned their backs on the gods and are ready to fight for Kronos and his idea of a “new Golden Age.”

So, here’s what we know: Alison is Apollo’s daughter in Percy Jackson and the Olympians. The same Apollo who is the god of the sun, music, healing, and archery. You can spot that connection right away as her go-to weapon is a bow and arrow. That’s classic Apollo (and Artemis) territory.

But Alison isn’t like most of Apollo’s kids. While others end up as healers or musicians at Camp Half-Blood, she took a much darker route. She finished her time at camp, grew up, and moved into the regular world. And then she made a choice, a scary one. Alison decided to side with Kronos. That’s what makes her story so unnerving.

At the beginning of Percy Jackson and the Olympians Season 2 Episode 3, Percy, Annabeth, and Tyson step onto the Princess Andromeda and think that the ship is just a means of taking them to the Sea of Monsters, which is again Hermes’ credit for helping them stow away. But they soon realize that the situation is worse than they thought: monsters are mixing with the mortals, and the only thing that separates them is the magical Mist that veils the supernatural world from the mortals’ eyes.

In the midst of Percy and Annabeth's discussion regarding the unusual situation, Annabeth is suddenly identified by one of her acquaintances: Alison Simms.

At first, everything looks to be perfectly normal. The first thing Alison does is she approaches Annabeth in a friendly manner and with a broad smile on her face, she greets her saying, "Glory to Athena. Honor to Apollo." Alison then continues to tell about her trip around the world with a group of friends whom she calls monster hunters and says that they are always on the lookout for supernatural threats and taking care of them whenever they appear.

While Annabeth is trying to tell her about the Laistrygonian giants they have just encountered on the ship, these cannibal monsters, Alison appears to be very concerned. Without any hesitation, she jumps in, expresses her wish to help, and even goes so far as to offer to bring her team along to tip the balance in favor of the monsters’ opponents.

Though Percy's empathy link with Grover, a psychic connection they share as best friends, reveals a disturbing truth in Percy Jackson and the Olympians. Percy comes to know that Alison is the same demigod who attacked Grover in the season premiere when he was on his own quest. She isn't hunting monsters at all; she is collaborating with them. Percy cautions Annabeth that Alison is bringing them into a trap, and the amiable front falls at once.

As soon as Alison gets called out, she doesn’t bother pretending to be friendly anymore. She just sneers and says:

“Luke won’t be happy when I bring him your heads. But he’ll get over it.”

That one line gives everything away. She is loyal to Luke Castellan, and she is ready to kill other demigods, even the ones she trained with at Camp Half-Blood. This isn’t some random run-in. It’s a setup. Luke’s people planned this ambush from the start in Percy Jackson and the Olympians.

A fierce confrontation erupts between Alison, Percy, and Annabeth. Alison, although outnumbered, shows herself as a strong opponent, and she is no stranger to fighting. She has been training with Luke's army. The skills she displays in the fight are a combination of her knowledge acquired at Camp Half-Blood and the additional training from Luke's group.

This whole action reflects the cruel truth that Percy and Annabeth are now up against in Percy Jackson and the Olympians: they are battling against former friends, demigods who have the same training and understanding of their universe as they do.

In the end, Percy saves Annabeth by tossing Alison off the ship and into the ocean. That gets her out of the way for a moment, but everyone knows she is not gone for good. Sure enough, Alison returns, dripping wet from her swim, storming straight into Luke’s admiralty suite with a bunch of monsters behind her.

When Percy, Annabeth, and Tyson try to sneak into Luke’s quarters, Alison and her crew trap them. She is still a big player in Luke’s army, no question about it.

Percy and Annabeth, after rummaging through Alison's things, come across a card that is marked with the symbol of Kronos, the scythe of the Titan lord. This object relates to a video that is constantly shown on the ship and suggests that the Princess Andromeda is not just an ordinary cruise ship. It is Luke's mobile command center, a floating base of operations where monsters and fallen demigods live together under the protection of the Mist from human sight.

The video promotes the ship as a place where "demigods and monsters" (though Luke's group avoids using the term "monsters" and prefers to call them "children of the gods") can have fun without fear or condemnation.

Percy Jackson and the Olympians Season 2 Episode 3 shows Percy and Annabeth the full scope of Luke’s plan. He has built an army of demigods, monsters, all sorts of creatures, everyone drawn in by Kronos’ promise of a “new Golden Age.” In this world, nobody gets left out or pushed around just because of who they are. Every demigod, spirit, and creature stands on equal ground, free from the gods’ constant favoritism and neglect.

Luke even calls out Tyson, Percy's cyclops half-brother, as proof. In Kronos’ world, Tyson would matter. No more jokes at his expense or side glances, he would actually belong, not like at Camp Half-Blood, where people mock him for being different.

Then there’s Alison Simms. She is Luke’s right hand. He trusts her to handle big stuff: recruiting other demigods, keeping the operation running smoothly, and jumping right into missions that push Kronos’ plans forward. Luke even sends her after Percy and Annabeth.

Alison’s thematic representation is what makes her very important in Percy Jackson and the Olympians. As the daughter of Apollo and a former Camp Half-Blood camper, she attracts the disillusioned demigods to Luke's message. Apollo is one of the gods of Olympus, but his daughter has turned away from the divine.

This indicates that Luke's critiques of the gods, that they are distant, show favoritism, and treat demigods as disposable, are listened to by all demigods, regardless of their divinity.

The incident shows that Alison is sure about the world-to-come that Kronos has promised. To say it differently, she is neither the one under threat nor the one being used. Instead, she has turned into a "true believer" of the cause. This kind of loyalty makes her more dangerous than a mere soldier for hire or someone acting under fear.

She really thinks that the victory of Kronos would usher in a better world, although it could mean the destruction of Camp Half-Blood and perhaps the triggering of a cataclysmic war between the Titans and the Olympians that would "tear the earth apart," as Percy cautions.

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Also Read: Percy Jackson and the Olympians Season 2 Episode 3 recap: Escaping Andromeda