After " Justice League: War ", the world is at peace, or it seems to be. When the Atlanteans attacked Metropolis because of the death of their king, the queen had a different plan. She needed the Justice League to find her lost son. But when the Justice League searched for him, the Atlantis army led by the Sea Lord continued their raid.
A navy submarine mysteriously sank in the Mariana Trench. The Justice League dispatched steel-bonded Victor (voiced by Shemar Moore) to investigate. However, Victor was attacked by a group of mysterious opponents at the scene of the accident. After that, Superman (voiced by Jerry O'Connell), Diana (voiced by Rosario Dawson), Flash (voiced by Christopher Gorham), Green Lantern (voiced by Nathan Fillion), Batman (voiced by Jason O'Mara), Captain Wonder, etc. Justice League partners gathered in the headquarters one after another, and after a joint investigation, it was discovered that the real murderer behind the scenes was actually related to the ancient Atlantis. Under the leadership of the ambitious Prince Aum, this group of deep-sea warriors declared war on mankind, and an all-out war between the two races was about to start. At the time of crisis, the man Arthur (voiced by Matt Lanter) who had just suffered the loss of his father not long ago became the key to the incident
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Taking this as an opportunity, the fate of Arthur and the entire Justice League changed.
