In a conversation with ComicBook, director James Wan disclosed that much of the baby storyline in the film is directly inspired by the comics. Wan explained, "Baby boy. Yes. It's their son, Arthur Jr. Yes, and that's basically taken straight from the comic book." He went on to elaborate, "The reason why we went down this path is because it felt like the natural extension of the first movie. I kept describing Aquaman II as the part B of the first movie, and so, a lot of the character arc and hero's journey that we had set up in the first film gets to grow. They grow and expand in the second one, and obviously, seeing, at the end of the first movie we see Arthur defeating his brother to become the king of Atlantis."

The Sorrowful Comic Book Origins of Arthur Jr.
Within the comic storyline, Black Manta, in a sinister act, abducted Arthur Jr. and confined the child within a sphere. The cruel method involved gradually filling the sphere with air, leading to Arthur Jr.'s tragic demise through suffocation. This heartbreaking event had profound effects on the dynamics between Arthur and Mera, rippling through the realm of Atlantis. Although the exact origin of Arthur Jr.'s story for the Aquaman sequel is undisclosed, there is potential for its narrative implications. Notably, with Arthur and Mera having a daughter named Andy Curry in recent Aquaman comic arcs, elements from her storyline could potentially influence the trajectory of Arthur Jr.'s journey in the film.

Exclusive: Unveiling the Unexpected On-Set Shenanigans of Aquaman 2 with  Jason Momoa!

Jason Momoa is set to return as Arthur Curry/Aquaman in "Aquaman and the Lost Kingdom," joined by Patrick Wilson as Orm, Amber Heard as Mera, Yahya Abdul-Mateen II as Black Manta, Nicole Kidman as Atlanna, and Randall Park as Stephen Shin. The film will also feature Jani Zhao, Indya Moore, and Vincent Regan portraying Stingray, Karshon, and Atlan, respectively. Pilou Asbaek has been included in the cast in a yet-to-be-revealed role.

"Aquaman and the Lost Kingdom" is scheduled to hit theaters worldwide on December 22.