Superman #13/1979

When Lori Lemaris washes ashore and is brought to the S.T.A.R. Labors, she tells Superman a chilling tale of an attack on her home, Tritonis — a city now under threat from Poseidonis, its long-lost sister. With Aquaman missing and the waters between the two Atlantean realms growing restless, Superman must dive into the depths to uncover the truth behind the rising conflict.

In "Krieg unter Wasser: Teil 2 - Der Herr der Meere," Superman and Aquaman face a sudden assault by sea creatures, but when the attack ends, Aquaman reveals a startlingly different account of what's really happening beneath the waves. With tensions rising and the truth buried in the depths of Poseidonis, the two heroes set out to uncover the source of the unrest—before the ocean's secrets consume them both.

In the depths of Tritonis, Superman and Aquaman confront Aquaman’s long-lost half-brother, the enigmatic Der Herr des Ozeans, who declares his brother’s fate with cold finality. With the weight of ancient blood and oceanic fury hanging in the water, the duo must flee before the wrath of the sea’s true master can claim them.

In "Krieg unter Wasser: Teil 4 - Das Geheimnis des finsteren Königs," Superman und Aquaman spüren eine ungewöhnliche Psi-Kraft im Thronsaal von Atlantis, führen ihre Suche weiter und stoßen auf den geheimnisvollen Herr des Ozeans. Als sie von ihm überrascht werden, entdecken sie, dass eine riesige Meduse mit telepathischen Fähigkeiten die Bewohner von Tritonis beeinflusst — und sich von Aggressionen nährt.