Disney has yet to meet a movie it couldn't make at least two sequels about. And this one was no exception to the people at Disney to give a weak story to receive a quick reward. Somehow, although I did not pay to view it, I feel cheapened by watching it.
Ariel is grown up now and had a daughter. Yet doesn't allow the daughter to go into the sea because of some idle threat made by the sister of the deceased sea-witch. So here we go again.
The daughter is tricked (of course) and helps the sea-witch. After a not-so-glorious battle, she is defeated and the mermaids and humans live in harmony. Yawn.
There is nothing to view here. Go back to your lives. "D-"