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Have a Cheese ’n’ Wiener! They’re on sale this week, and I’d hate to kill you on an empty stomach.

–Stheno, in The Son of Neptune

Stheno is one of the Gorgon sisters of Medusa and Euryale. She and her sister Euryale were immortal while their third sister, Medusa, was mortal. She had faded, but was revived by Gaea by some manner.

Percy Jackson and the Olympians

The Lightning Thief

When Percy Jackson, Annabeth Chase and Grover arrive at Medusa's shop, Percy asks what happened to her sisters. She claims that she is the only one left, alluding to her sisters, the Gorgons.

The Battle of the Labyrinth

On their quest through the Labyrinth, Tyson urges Briares to summon his brothers to help the unprotected Camp Half Blood. Briares tells the demigods that his immortal brothers do not exist anymore. Percy then remembers that Medusa's sisters also were forgotten immortals and they passed on.

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Stheno on the UK cover of The Son of Neptune.

The Heroes of Olympus

The Son of Neptune

Percy first saw her on a Bargain Mart store posing as a greeter. At first Percy thought that her name is "Beano" until he decoded a big green button that said, "Welcome! My name is Stheno." She is described by Percy as appearing like a dumpy old grandmother, but her hair is actually vipers. She also has bat wings on her back and tusks sticking out the corners of her mouth. She is said to always carry around her big silver platter of free samples: Crispy Cheese 'n' Wieners. Percy already killed her but she, along with her sister Euryale, just kept reforming, due to Thanatos being chained. She also unwittingly tells Percy that the blood taken form the left side of her body was poisonous, but blood taken from the right had healing powers. To get away from them, Percy uses the plate of free samples to snowboard down the hill.

She seems to inform Polybotes about their force's current state. She also tends to call a hot-dog a Puppy-in-a-Blanket, and when she offers one to Polybotes he first thinks she means an actual puppy, but later when she explains that it's about a hot dog, he ignores it. During an assault on Camp Jupiter she and her sister are attacking the giant Eagles. They are both killed at the end of the battle, possibly by Mrs. O'Leary.

Personality

Stheno has a relatively carefree personality with a somewhat naive disposition as seen e.g. when she thinks that her reflection is Medusa. She is slightly friendlier than her sister Euryale, and was hurt when Euryale told Percy that Medusa was the most hideous gorgon in their family. Ever since she "worked" at Bargain Mart, she has had a sales person attitude, trying to sell food at random times.

Monsters
Species: Centaur | Cyclopes | Dragon | Drakon | Empousa | Fire-Breathing Horse | Giants | Gorgon | Harpy | Hyperborean Giant | Ichthyocentaur |

Katobleps | Laistrygonian Giant | Lycanthrope | Merpeople | Nikai | Nymphs | Pegasus | Satyr | Skolopendra | Stymphalian Birds | Telekhine | Blemmyae

Friendly Monsters: Argus | Blackjack | Briares | Chiron | Don | Ella | Festus | Gleeson Hedge | Gray |Grover Underwood | Hippocampus | Mellie | Mrs. O'Leary | Ophiotaurus | Peleus | Scipio | Tyson | Tempest
Enemy Monsters: Agrius and Oreius | Arachne | Basilisk | Charybdis and Scylla | Chimera | Chrysaor | Clazmonian Sow | Colchis Bull | Echidna | Euryale | Geryon | Joe Bob | Kampê | | Nanette | Manticore | Medusa | Minotaur | Nemean Lion | Polyphemus | Sphinx | Stheno | Typhon | Scythian Dracanae
Neutral Monsters: Carnivorous Sheep | Cerberus | Erymanthian Boar | Gray Sisters | Gorgons | Furies | Flesh-Eating Horse | Gryphon | Siren