Warner Bros. has released the first trailer for Aquaman. Starring Jason Mamoa in the titular role, Aquaman follows his rise from the son of a lighthouse keeper to ruler of Atlantis. But the journey along the way isn't easy. Despite DC's shaky run in creating their own cinematic universe, I was optimistic about Aquaman thanks to director James Wan. Based on the trailer, this looks to be a fun and more light-hearted entry in the DCEU. While some of the underwater effects are a bit too cartoony, they could easily be unfinished. Between this and Shazam, Warner Bros. might be course-correcting their universe in the right direction. Aquaman opens December 21.