The 2 1/2-minute clip has gotten nearly 10 million views since Warner Bros. posted it on YouTube Saturday.
In the preview, the titular son of a lighthouse keeper and a queen discovers he has the power to communicate with fish and other sea creatures. He is called upon to help when his evil half-brother, who rules an underwater society, wages war on "the surface world" inhabited by humans.
The James Wan-helmed picture is scheduled to open is U.S. theaters Dec. 21.
The studio also unveiled a new, 3-minute trailer for Kravitz's upcoming fantasy movie, Fantastic Beasts: The Crimes of Grindelwald, the same day. It has already gotten about 2.3 million views.
Directed by David Yates, the movie is scheduled for theatrical release Nov. 16.