DC movie where one brother goes bad and makes himself a monster

Black Manta seeks revenge on Aquaman for his father's death. Wielding the Black Trident's power, he becomes a formidable foe. To defend Atlantis, Arthur (Aquaman) forges an alliance with his imprisoned brother. They must protect the kingdom.

Aquaman must battle foes in the air, on land and in the depths of the Seven Seas, along with some help from The Justice League, to save the day.

Chosen the world’s protector against the Seven Deadly Enemies of Man – pride, envy, greed, hatred, selfishness, laziness and injustice – young Billy Batson accepts his destiny as Captain Marvel. Battling alongside Superman against nefarious Black Adam, Billy soon discovers the challenge super heroes ultimately face: is it revenge or justice?

A boy is given the ability to become an adult superhero in times of need with a single magic word.

The Joker is aided in his Halloween quest to render modern technology useless and take over Gotham City by Solomon Grundy, Silver Banshee, Clayface and Scarecrow.

In an alternative history Zod is Superman's father, Batman is a vampiric Man-Bat, and Wonder Woman is the child of Ares, God of War. When these dark heroes form an alliance, the question everyone asks is will they save the world, or rule it?

In the same vein as Cain and Abel, here we have two brothers, one a renegade cop and the other a murderer with a taste for little boys. The brothers come to blows, from which only one can walk away.

Former Gotham City District Attorney Harvey Dent, one side of his face scarred by acid, goes on a crime spree based on the number '2'. All of his actions are decided by the flip of a defaced, two-headed silver dollar.

Yup Yup Man is a schizophrenic street man who wants to become a crime crusader like Dark Justice, his favorite comic book. As he focuses on his crime fighting crusade, his delusional traits weaken, making him seem outwardly normal. In the end, he must choose between a destructive world of crime fighting or aspiring to grow his inherent goodness.

A boy falls in toxic waste. His face melts and he becomes a bloodthirsty monster who goes around killing people.