In Greek mythology, Karkinos came to the Hydra's aid sent by Hera. It was defeated and kicked into the stars by Hercules with him only using his bare hands. It is also said that Hercules crushed a giant crab under his foot.
Afterwards, Karkinos was honored as the constellation Cancer.
|“||Hey, crabby. I'm just gonna scoot around you so-||”|
While Percy Jackson was on board Princess Andromeda with Charles Beckendorf on their mission to blow up the ship, Percy had to distract the monsters so Beckendorf had time to plant the bombs. Percy met Karkinos on the fountain in the middle of the courtyard, in the promenade. While fighting it, Percy defeated Karkinos by making the ground slick with water, and then sliding underneath him to stab the Crab in its weak spot, which was the belly, with Riptide. He did this by remembering what Paul Blofis had taught him during their crabbing trip. Karkinos dissolved, leaving behind its empty shell as a spoil of war.
|“||I'm not talking "giant" like $7.99 all-you-can-eat Alaskan king crab. I'm talking giant like bigger than the fountain. The monster rose ten feet out of the water. Its shell was mottled blue and green, its pincers longer than my body.||”|
Karkinos was bigger than a large water fountain, precisely ten feet tall, its shell mottled blue and green. It had pincers longer than Percy Jackson's body and black eyes full of intelligence and hate. It had a terrible smell, similar to that of garbage. It constantly foamed at the mouth when Percy encountered it.
- It has hard, powerful pincers longer than a man's body.
- It possess amazing speed.
- It has a near impenetrable shell.
- It can launch a spray of pressurized water.
- Its original form might have been the giant crab Karkinos.