Arabella Anderson is wanted. She's not exactly sure why, but she's on the run anyhow. Despite her attempts at staying hidden, she's discovered by the Justice League and asked to join they're covert missions team, Young Justice. Under the name Zenaida River, her and the team must infiltrate a gang of teenage drug dealers. Although, the Eximius Serum is no regular drug. It's unbelievably addictive, gives the user the powers of Superman and more, and can kill them instantly. Now, Ara and the team must to stop them from unleashing it into the world, without being discovered.