Young Justice:The Light

Plot
Atlantic Ocean

2019

Vulko the lead Atlantean scientists found the still-frozen creature like starfish. Vulko transferred that to Poseidon's Science Center, where it was carefully studied.

GOTHAM CITY

2024

At the docks, the team chases some thugs in a moving truck and crashes it into a wall. They tries to interrogate them until the box that was in their truck opens and reveals Amazo, a powerful android with the ability to copy the abilities of every metahuman it encounters. After a short fight, the robot is defeated.

back in mount justice Kaldur took leave of absence to go back to  Atlantis.

POSEIDONIS

2024

Kaldur returns to Atlantis and swims through the city with his king, who tells  Kaldur about a dinner he and Queen Mera are hosting. He later finds his childhood friends Tula practicing with Queen Mera. Queen Mera invites Kaldur to her dinner.

meanwhile, Black Manta and his crew attack some palace guards. Black Manta sticks a bomb on one of the palace walls. at the dinner party, King Orin said that he and the queen had an announcement to make. Queen Mera said that she was pregnant and everyone got excited. Kaldur congratulated the king and said there finally will be an heir to the throne he then apologizes to Prince Orm because he didn't want to offend him. He tells him that it wasn't a big deal and that he was most happiest for the new baby as Orin thanked him.

While he and Queen Mera are kissing, he gets a message from Superman telling him there's an emergency in Tokyo Bay. He then tells everyone that he has to leave.

After Orin left Kaldur meet with Tula when a building explodes due to a bomb Black Manta's crew set. Queen Mera and Prince Orm quickly rushes to the scene. They all begin to fight Black Manta's men. Prince Orm said that he must protect both the queen and the heir. Queen Mera insisted that she didn't need any protection and for them to go. Prince Orm explained that Orin would never forgive him if she or the heir got hurt as Kaldur agreed with saying the battle was his. David Kane and his crew in the Science Center are trying to steal the giant starfish creature. Inside the Science Center, David Kane commands that one of his men to check the perimeter and says that once the Manta Ray ship melts through the roof above the starfish, they will take the starfish and go. Kaldur fight off black manta and his gang but David Kane blew up the creature out of spite. A small piece survived the blast and began regenerating. Prince Orm decided that it would be best that the piece be taken to the surface world for further studies, considering the fact the Science Center had been greatly damaged and could not safeguard the piece. It was eventually examined in Gotham City's STAR Labs.

Back in the depth of the ocean, David Kane reports to the Light that the mission was a failure and was forced to execute Plan B. Prince Orm praises him for doing so.

Later, Lawrence Crock sneak into the STAR Labs facility in Gotham and steal the echinoderm sample. The Light arranged for Professor Ivo to be broken out of Belle Reve Penitentiary to work on the echinoderm With Klarion, he turned it into Starro-tech, tiny chips of biocircuitry that enslaved whomever was exposed to it.

Press has gathered outside the Hall of Justice. From behind a lectern, Superman gives a speech. They are gathered to introduce new members of the Justice League: Shayera Hol, John Stewart and Roy Harper.

The Team is quickly briefed about the signal Dick received: Jade Nguyen was reported boarding a plane in Asheville, and she carried the briefcase containing the modified echinoderm. They trace Jade Nguyen's plane but discover that it has crashed, and the Team lands to investigate. There is no sign of any bodies, but Jade Nguyen emerges from the shadows. She's brought company: Edward Nigma, Selinda Flinders, Baran Flinders, and a group of mercenaries with Apokoliptan weaponry. team stop them and takes their captives into custody. They discover Jade left the suitcase behind.

back in mount justice, Batman congratulations the team. They have also discovered that the villains were using some kind of biotechnology integrated with nano-machinery. Batman and John Stewart are perplexed with the mysterious biotechnology.

Once the adults leave, Robin points out that someone on the Team must have tipped off the villains. They explain to Rocket that for a while they believed there was a traitor on the Team.

Back at watchtower, Batman investigates the bio-circuitry when Red Arrow comes in to check on him. He surreptitiously slips a chip on the back of Batman's neck, mentally enslaving him. In the central hall, all the other Leaguers have suffered the same fate. Batman activates the Zeta-Tube to grant access to Vandal Savage. Red Arrow suddenly wakes from his obedient trance, and looks around to see, in shock, that he himself was the mole. Savage coldly confirms it and proceeds to the observation window to gaze upon the sun setting behind Earth.

it turn out before roy was invite to justice league Roy was chasing sportsmaster where he was mentally enslave by  Starro-tech.

at mount justice, Batman reveals that Red Arrow was the mole. while the team having conversation with batman, green arrow and black canary they try to put Starro-tech on the team when suddenly batman call the team "kids" and dick realize something is wrong and see Starro-tech on league hand. team have fight the league and escape. team learn the whole league is under mind control.

the team divid into two team one team went to Atlantis to create Cure-tech from the help from  Queen Mera and  Vulko and other team went to  Project Cadmus get help from Dr. Serling Roquette and Dr. Amanda Spence.

Robin shut down the Watchtower security systems and the Team has infiltrated the satellite. Using cure-tech, they take out the mind control league. Realizing the Team has found a cure to negate the effects of Starro-tech, Vandal Savage gives orders to dispose of the Team. Artemis and Kid Flash are in the cargo hold and struggling to battle Green Arrow, Aquaman and Flash simultaneously. Aqualad rushes to their aid and opens the airlock. He and his teammates hold on while the pressure out-rush begins to suck out the three adult heroes. Once Aqualad closes the outer door, the three adults are thrown into the door and knocked unconscious. Kid Flash quickly applies the cure-tech to the three Leaguers. Batman goes after Robin while Miss Martian fights her uncle and Superboy battles Superman. Miss Martian takes on her true form and telepathically induces Martian Manhunter's weakness to fire, and tags him with Cure-tech. Robin and Superboy join forces and first take out Batman. Superboy then holds Superman long enough for Robin to use a piece of Kryptonite that he stole from the Batcave to weaken both Kryptonians and tag Superman with cure-tech.

Savage watches the battle on the monitor and tells Klarion they have to leave. Klarion wants to stay and fight but Savage warns that they might destroy the satellite, or kill several League members, and the Light can't have that, since Klarion might lose control and "bring the chaos in." Klarion teleports them both away just in time and league congratulates the young heroes on their victory.