Don't be too discouraged when you read it, dear. He does have your interests at heart.

–Martha, talking to Percy in The Sea of Monsters

Martha is a snake caught by the god Hermes. She is immortal, though she isn't a monster. Demigods and gods can hear her speaking to them in their minds. Martha is always seen with her male counterpart and husband George.

Percy Jackson and the Olympians

The Sea of Monsters

Martha makes her first appearance when Hermes visits Percy near the lake in Camp Half-Blood. She gives the Thermos of winds as a gift for Percy, as well as continually having to scold George for saying things that are out of the conversation or for teasing Percy.

Martha appears the second time with Hermes to deliver a letter from Percy's father, Poseidon. She advised Percy to not be discouraged when he reads it.

The Last Olympian

Hermes arrives in Olympus to deliver a message, Martha and George with him. Percy says something that anger Hermes and when he tries to punish him, Martha and George come to the rescue and whisper to Hermes that Percy has the curse of Achilles.

Martha and George were with Hermes at the end of the Second Titan War when Luke Castellan had died. Martha was whispering, "Luke, poor, Luke." They were silent when Hermes talked to Percy.

Heroes of Olympus

The Demigod Diaries

Percy Jackson and the Staff of Hermes

George and Martha are stolen by Cacus when Hermes accidentally leaves them in the Hermes Express truck. Cacus tried to make the snakes obey him, but Martha calls out to Percy when he comes to save them with Annabeth Chase. While Cacus again attempted to make the snakes follow his command, George and Martha would try their best to mess him up, such as when they changed into a phone when he tried to turn Annabeth into stone. Despite their best efforts, Cacus eventually got Martha and George to change into Laser Mode, and he chased the two demigods around New York. When Percy got the caduceus back, George and Martha gladly changed into Laser Mode to defeat Cacus.


Martha is much more firmer, kinder and more understanding than her counterpart George. While he normally asks for rats or guinea pigs, she is constantly getting trying to get him back on topic and correcting him when he makes a mistake. Whenever Percy is confused, she would encourage him and guide him back.


When the caduceus morphs into a phone, Martha is on the antenna. She becomes a pen when their costumers receive their packages to sign their receipt.


Percy Jackson and the Olympians
Core Series: The Lightning Thief | The Sea of Monsters | The Titan's Curse | The Battle of the Labyrinth | The Last Olympian
Main Characters: Percy Jackson | Grover Underwood | Annabeth Chase | Tyson | Clarisse La Rue | Thalia Grace | Nico di Angelo | Chiron | Luke Castellan | Rachel Elizabeth Dare
Minor Characters: Travis Stoll | Connor Stoll | Mrs. O'Leary | Silena Beauregard | Charles Beckendorf | Sally Jackson | Paul Blofis | Blackjack | Zoë Nightshade | Bianca di Angelo | Juniper | Michael Yew | Ethan Nakamura
Olympian Gods: Zeus | Hera | Poseidon | Demeter | Ares | Athena | Apollo | Artemis | Hephaestus | Aphrodite | Hermes | Dionysus | Hades | Hestia
Minor Gods: Amphitrite | Ariadne | Hecate | Iris | Janus | Morpheus | Nemesis | Pan | Persephone | Triton
Titans: Kronos | Atlas | Calypso | Iapetus | Krios | Hyperion | Oceanus | Prometheus
Related Content: Rick Riordan | The Lightning Thief (film) | The Sea of Monster (film) | The Demigod Files | Demigods and Monsters | The Ultimate Guide | The Heroes of Olympus
The Heroes of Olympus
Core Series: The Lost Hero | The Son of Neptune | The Mark of Athena | The House of Hades | The Blood of Olympus
Main Characters: Jason Grace | Piper McLean | Leo Valdez | Percy Jackson | Frank Zhang | Hazel Levesque | Annabeth Chase | Reyna Ramírez-Arellano | Nico di Angelo | Gleeson Hedge
Secondary Characters: Hylla Ramírez-Arellano | Dakota | Tyson | Ella | Octavian | Halcyon Green | Dr. Howard Claymore | Alabaster C. Torrington | Lamia | Iapetus/Bob
Minor Characters: Rachel Elizabeth Dare | Grover Underwood | Thalia Grace | Fleecy | Mrs. O'Leary | Kinzie | Arion | Calypso | Lou Ellen Blackstone | Chiron | Will Solace | Tristan McLean | Don | Julia | Jacob | Michael Varus
Olympian Gods: Zeus | Hera | Poseidon | Hades | Ares | Demeter | Athena | Apollo | Artemis | Hephaestus | Aphrodite | Hermes | Dionysus
Minor Gods: Achelous | Aeolus | Asclepius | Boreas | Eurus | Enyo | Hecate | Iris | Hypnos | Keto | Khione | Kymopoleia | Mithras | Nemesis | Nike | Notus | Phorcys | Serapis | Thanatos | Triptolemus | Zephyros
Roman Gods: Jupiter | Juno | Neptune | Pluto | Mars | Minerva | Ceres | Lupa | Bellona | Fortuna | Janus | Terminus | Vulcan | Mercury | Apollo (Roman) | Diana | Venus | Bacchus | Pomona | Aquilon | Hercules | Cupid | Auster | Favonius | Letus | Victoria | Orcus
Giants: Enceladus | Porphyrion | Alcyoneus | Polybotes | Ephialtes | Otis | Damasen | Clytius | Mimas | Orion | Hippolytus | Thoon | Periboia
Undead: Medea | Midas | Lityerses | Gray | Phineas | Otrera | Echo | Narcissus | Sciron | Pasiphaë
Primordial Gods: Gaea | Tartarus | Ourae | Nyx | Chaos | Ouranos | Akhlys | Erebos | Hemera | Elpis | Spes
Monsters and Magical Creatures: Cynocephali | Gorgon | Gryphon | Harpy | Basilisk | Lycanthrope | Gegeines | Cyclops | Katobleps | Unicorn | Giant Eagle | Ichthyocentaur | Satyr/Faun | Storm Spirit | Laistrygonian Giant
Related Content: Rick Riordan | Percy Jackson and the Olympians | Demigods and Monsters | The Ultimate Guide | The Demigod Files | The Demigod Diaries | The Son of Sobek | The Singer of Apollo | The Staff of Serapis | Percy Jackson's Greek Gods | Percy Jackson's Greek Heroes | The Crown of Ptolemy | Demigods & Magicians | Demigods of Olympus | Percy Jackson Demigod Collection

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