Due to his status as Greek god of the sea, the character has figured primarily in stories relating to two of DC Comics' main superhero properties: Wonder Woman (an Amazon warrior with various connections to the Greek pantheon) and Aquaman (the king of the underwater city of Atlantis).

Poseidon's history in Greek mythology is the same in the DC Comics universe, including the fact that he's the brother of Zeus and Hades.

When the Amazons freed themselves from enslavement arranged in part by Ares, the founding Goddesses of that people received the help of Poseidon, who had a deep grievance against the war god, to get the Amazons to safety by parting the sea waters to create a path to the island of Themyscira.

[1] With the help of Proteus, Poseidon sees into the future where he takes an interest in Mera and plans to make her his wife.

Zeus proposes a contest to retrieve a golden apple beneath the sea, with Mera going to the winner.

Poseidon vows to mend his ways, and Aquaman gives him a pod with which he can travel back to his normal era.

[3] Zeus, Hades, and Poseidon meet atop the corpse of their father and revise their pact.

[6] In The New 52 reboot of DC's continuity, Poseidon is reintroduced when Wonder Woman arrives at the Thames River in order to gain an audience with him.

He will return the First Born's weapon and allow him to overtake Mount Olympus in exchange for leaving the sea and the Underworld to its current rulers.

[11] Like the other Olympian Gods, Poseidon possesses super-strength, super-speed, shapeshifting, immortality, and invulnerability.