"Justice League - Throne of Atlantis" sets the stage for the DCEU's animated universe, laying the groundwork for future films and crossovers. The movie's success paved the way for other animated films, such as "Justice League: War" and "All-Star Superman."

Meanwhile, a powerful artifact known as the Throne of Atlantis becomes the focal point of a global conflict. The throne holds the key to unimaginable power and is coveted by various nations, including Atlantis, Themyscira (Wonder Woman's homeland), and even the surface world.

The movie revolves around the aftermath of Superman's death in "Batman: The Brave and the Bold - The Movie." The world is in chaos, and Atlantis, under the leadership of King Atlan, seeks to reclaim its rightful place among the nations. However, their plans are thwarted by Arthur Curry, also known as Aquaman, who is reluctant to assume his royal duties.