Currently you are able to watch "Aquaman" streaming on HBO Go. It is also possible to buy "Aquaman" on Apple TV, Google Play Movies as download or rent it on Apple TV, Google Play Movies online.
Once home to the most advanced civilization on Earth, Atlantis is now an underwater kingdom ruled by the power-hungry King Orm. With a vast army at his disposal, Orm plans to conquer the remaining oceanic people and then the surface world. Standing in his way is Arthur Curry, Orm's half-human, half-Atlantean brother and true heir to the throne.