Black Manta is treated as a secondary villain to King Orm. Early in the movie, Black Manta and Aquaman clash after Aquaman rescues a Russian sub that Manta tries to hijack. Then we see him get an under-the-table weapons upgrade from King Orm, who believes he can use Manta to do his dirty work and dispatch Aquaman — Manta uses his new weaponry to fashion a laser beam-firing helmet for himself. Finally, in the film’s third act, Mera and Aquaman, while traveling to find the magic trident, catch up with Manta in Sicily, defeat him, break his helmet, and throw him into the ocean
Durring the mid credits Manta is floating unconscious in the sea and gets rescued by men on a boat. It’s not entirely clear who his saving him, but as we see shots of the boat’s interior, we see that whoever it is has a deep interest in Aquaman’s identity — various newspaper clippings about Aquaman are pinned to a board and connected with string in a heavy-handed, “whoever did this is a conspiracy theorist” type of way.
When Manta wakes up, it’s revealed that his rescuer is Doctor Stephen Shin (Randall Park). In the Aquaman comics, Shin is a genius-level scientist with ties to Aquaman; He appears in a couple brief moments during the movie, as a scientific expert and researcher working on land who believes Atlantis is real.
The credits scene shows Manta and Shin making a pact: Shin will help Manta find out Aquaman’s true identity and repair Manta’s laser beam-firing helmet and Manta will reveal the secret of Atlantis to him.
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