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An overview of Poseidonis.

Poseidonis is a city state and the capital city of Atlantis, located in the Atlantic Ocean and ruled by High King Mera Nereus.[1]


Located in the eastern Atlantic,[nb 1] Poseidonis is a large underwater city divided into five sectors. Both the Conservatory of Sorcery and the Science Center are located here, and it is the seat of power of King Orin and Queen Mera.

The Justice League has a Zeta-Beam transport tube connected up at Poseidonis.[2]



August 27, 13:00 UTC-2

At a time when Orin was absent, Black Manta attacked the capital. It caused severe structural damage, but the main objective, securing the echinoderm in the Science Center, was only partially achieved.[2]

September 6, 08:06 UTC-2

After meeting with Queen Mera and Prince Orm, Aqualad, Miss Martian and Superboy visited the Conservatory of Sorcery.[3]

September 6, 19:27 UTC-2

While talking with his old friends Garth and Tula, Aqualad learned about the purist uprisings. They had to break up a row between conservatory students about that very subject.[3]

September 6, 23:45 UTC-2

Ocean-Master and the purists kidnapped Mera from her royal quarters. She was brought to the S'atiroman Cave.[4]

September 7, 00:41 UTC-2

Orm and Aqualad organized a counterattack. Orm deliberately sent Kaldur to an ambush at the Old Roman's Trench.[4]

September 7, 07:01 UTC-2

After defeating Ocean-Master, Orin thanked his protégé for the safe return of his queen and unborn son.[4]


June 13, 23:45 UTC-2

Miss Martian traveled to Atlantis's capital to meet up with Lagoon Boy, who had been living in the city to recuperate from wounds sustained three weeks earlier. They left in the Bio-Ship together.[5]


January 02, 11:19 UTC-2

Aquaman brought a water-breathing meta-teen through the Zeta-Tube to start her new life in Atlantis. He cast a translation spell to allow her to communicate. He later introduced her to King Orin before taking her to meet his parents in Shayeris, where she would be staying.[6]


May 14, 07:50 UTC-2

Mera used a hard-water octopus to try to extinguish a pillar of fire that Child had created just outside the Poseidonis dome.[7]


See also


  1. The City's precise location has not yet been revealed, but the timestamps in "Downtime" place Poseidonis in UTC-2, the eastern Atlantic.


  1. Catt, Mae (writer) & Heuck, Vinton (director) (March 31, 2022). "Nautical Twilight". Young Justice. Season 4. Episode 14. HBO Max.
  2. 2.0 2.1 Hopps, Kevin (writer) & Oliva, Jay (director) (March 4, 2011). "Downtime". Young Justice. Season 1. Episode 8. Cartoon Network.
  3. 3.0 3.1 Weisman, Greg, Kevin Hopps (w). Jones, Christopher (a). Atkinson, Zac (col). Sienty, Dezi (let). Chadwick, Jim (ed). "Under the Surface..." Young Justice 14 (March 21, 2012), New York, NY: DC Comics
  4. 4.0 4.1 4.2 Weisman, Greg, Kevin Hopps (w). Jones, Christopher (a). Atkinson, Zac (col). Sienty, Dezi (let). Chadwick, Jim (ed). "...Here There be Monsters" Young Justice 15 (April 18, 2012), New York, NY: DC Comics
  5. David, Peter (writer) & Zwyer, Mel (director) (March 2, 2013). "Intervention". Young Justice. Season 2. Episode 18. Cartoon Network.
  6. Weisman, Greg (writer) & Zwyer, Mel (director) (July 30, 2019). "Quiet Conversations". Young Justice. Season 3. Episode 20. DC Universe.
  7. Vietti, Brandon (writer) & Sotta, Christina (director) (December 23, 2021). "Og Htrof Dna Reuqnoc!". Young Justice. Season 4. Episode 12. HBO Max.