(Photo by Desiree Navarro/WireImage/Getty Images)

Jason Momoa will get some help defending Atlantis against interlopers from a teenage warrior—Deadline reports that Ludi Lin, who played the Black Ranger in the rebooted Power Rangers, has joined the cast of Aquaman. Lin is set to play Murk, the leader of the Men-of-War, which is like the Atlantean infantry. He’s also Aquaman’s “trusted ally,” and will help Arthur Curry battle his half-brother Orm Marius (a.k.a Ocean Master), who’s played by Patrick Wilson, as well as Yahya Abdul-Mateen II’s Black Manta.

This is a huge move for Lin, especially considering Power Rangers didn’t exactly bowl over audiences during its theatrical run this year. His other recent credits include a guest spot on Marco Polo and a TV movie called Holiday Spin. Now he’s playing a royal confidant in James Wan’s entry in the DCEU, which will bow December 21, 2018.