Steropes the Lightning Bringer was one of the Cyclopes, hybrid-beasts created by the Isu as part of the Olympos Project. During the 5th century BCE the beast was held in a cave within the Bay of Nobody on the Greek island of Andros.
- Like Brontes and Arges, Steropes was the name of one of the sons of Uranus and Gaia. The name, Στερόπης in Ancient Greek, meant 'lightning'.
- Steropes and his brothers, Brontes, Arges and the Hecatoncheires were cast into the pits of Tartarus by their father, who was ashamed of his monstrous sons. Kronos, who deposed Uranus shortly thereafter, freed them briefly before imprisoning them again. They were later freed by Zeus during the Titanomachy, and forged his famed thunderbolts, along with Poseidon's trident and Hades' helm of darkness.
- Even though Steropes' eye looks similar to Brontes', Kassandra does not retrieve an artifact after defeating him.