Wonder Woman and/or Aquaman
Aquaman would start with Arthur Curry on land, arguing with his dad, only to come home to find the guy killed. Arthur finds Vulko there, fights him, and eventually finds that it was not him, but Atlantean soldiers who killed his father. Arthur doesn't believe him, until the soldiers find them both, and Vulko unlocks Arthur's abilities by removing his birthmark. The boy starts breathing underwater, and kicks some butt, but not much. Going back to atlantis (blue screen stage in the style of 300 or Sky Captain), he meets the resistance, led by Sorceress Mera, Vulko gets captured, "Orin" embarasses himself thinking he can march right in and pwn the Ocean Master, who turns out to be his brother, Orm. He gets the resistance obliterated, himself and Mera stranded far away, learns how his mother died, meets and saves Garth, and basically mans up to his responsibilities and finally 'gets' the fish thing. From there, he returns to the palace, faces down soldiers and such, and then has to head back to land to fight hte Kraken or whatever monster Orm has thrown at him. He throws a sunken oil tanker at the the thing taking it down. The other Kraken then obey his orders. He returns with his ocean army to battle Orm, save Mera and take his throne.
So basically, bits of everything but with Aquaman and fish-control on top.