After being marooned for five years on a remote island, billionaire Oliver Queen returns home with a mysterious agenda and a lethal set of new skills that he uses in a war on crime in this hard-hitting action series. After suffering unimaginable ordeals on the island, Oliver returns to Starling City a new man, determined to right the wrongs of his father and sworn to bring justice to those who've corrupted his city.

Sisters of the sea, Siren and Mera catch the students of Super Hero High off guard in a surprise attack to steal a very powerful relic, the Book of Legends. With the book in her possession and harnessing more power than ever, Siren aims to raise an army from the dephths of the ocean's trenches. It's up to Wonder Woman, Batgirl, and Supergirl to help Aquaman in defending Atlantis and stop the sinister Siren.

As the fastest man alive, Barry Allen, aka The Flash, faced metahuman threats from both this world and the parallel world of Earth-two. In Season Three, Barry faces the unknown, as he irrevocably alters the timeline by saving his mother from the clutches of the Reverse-Flash. The only question now, as he remains trapped in his own Flashpoint Paradox, is will he be able to find a way out?

What if Superman never existed? Set two generations before the destruction of Superman's home planet, this story follows Seg-EI, the legendary Man of Steel's grandfather, who is faced with a life-and-death conflict: save his home planet or let it be destroyed in order to restore the fate of his future grandson. With Krypton's leadership in disarray, Seg must balance the quest to redeem his family's honor and protect the ones he loves while being challenged...

DC's strangest group of heroes is back again to save the world - that is, if they can find a way to grow up.