After Cyborg detects a massive disruption in the ocean located at where Atlantis resides they rush down to earth to investigate and find that the oceans have been pushed back from around the under water city to reveal it now entombed by an unbreakable dome. Wonder Woman suspects magic is at work.
Jessica advises them that the water around the dome is not behaving as it should and the backlash from the ocean striking the dome has caused a huge Tsunami that is about to hit the East Coast of the United States.
The team immediately rush to avert disaster but are surprised to find that it is in fact Mera who is causing the waves. As they try to reason with her in order to find out what it is that is motivating her actions, she lashes out and uses her Aquakinetic powers to take them all down one by one.
Batman finally manages to use a sonic screamer on her to disrupt her concentration and they manage to talk her down. She warns them that they cannot help in the affairs of Atlantis or their interference will be seen as an act of war. They too will fail in trying to free her husband now that he has been removed from the throne.
She also realises how foolish her actions had been but she is desperate. Wonder Woman assures her that they all want to help her juts as they would Arthur and that they are here for her in any way they need her.
They then all return to the Watchtower Satellite and she explains how lonely she feels now she has no home to go back to. As another unrelated emergency call comes in and the team prepare to leave Batman suggests she joins.
Simon privately asks Batman if that is such a good idea seeing how easily she had taken them all down and he smiles and replies if she can do that to the Justice League, just think what an asset she could be in helping to take down their opponents.