Arthur and Mera's twins Arthur Jr and Ariel are both 7 years old. And Arthur begins training his son. Meanwhile, David Hyde (Black Manta) will return with vengeance against The Aquaman. Manta brings his son Jackson with him whose just turned 18, to meet and kill the man who 'murdered' his grandfather. Black Manta will kill young Arthur Jr. Will Aquaman kill Black Manta?