I was prepared to kind of like this movie, but… eh. I kept thinking "Underwater Thor".
Why is it that I can totally buy into Captain America or Batman, and get so blah about Aquaman?
Anyway: this movie covers Aquaman's origin story. Mom was a queen of Atlantis, Dad was a lonely lighthouse keeper. They found love when Mom, injured while escaping from her oppressive underwater society, is nursed back to health. And then Aquababy was born. But soon Atlantean thugs show up, Mom goes back to the water, Aquababy becomes Aquakid, confronts bullies at the aquarium (really, that's pretty cool), and then goes on to become the AquaDude himself.
Then the rest of the plot happens, but it's absurd and not very interesting. An extra star for the aquarium scene, though.