Con la mayor parte de la Liga de la Justicia en una misión, Firestorm es el único que se queda deteniendo el ataque de una familia de robots llamados La Familia Nuclear cuando estos intentan atacar una planta de energía nuclear.

Mientras Superman le da a Blue Beetle, Firestorm y Stargirl un tour por la Fortaleza de la Soledad , se enfrentan con el General Zod, Faora, y un villano kryptoniano no identificado que accidentalmente resultan liberados de la Zona Fantasma. Ahora, con Superman atrapado dentro de la dimensión, los tres jóvenes héroes adolescentes deben trabajar juntos para poder detener a los villanos kryptonianos.

Mr. Freeze vuela en su avión para congelar a toda Ciudad Gótica utilizando el poder de Killer Frost como su fuente de energía. Mientras Batman se enfrenta a Mr. Freeze, Firestorm tendrá que enfrentarse a Killer Frost y al mismo tiempo se enamora de la villana.

In order for Batman to lure Deadshot into a trap, he has Plastic Man pose as Two-Face. Things go well at first until the real Two-Face escapes from Firestorm's custody.

When Swamp Thing has a blind date with Poison Ivy which leads to her controlling him in her plot to overrun Gotham City with plants, Batman works on an antidote to free Swamp Thing from Poison Ivy's control. Meanwhile, Poison Ivy is collaborating with Harley Quinn to help her keep Swamp Thing in check. So Superman, Firestorm, and Vixen work to fight Poison Ivy and Harley Quinn on their home turf.

As the Justice League tries to protect the United Nations from Gorilla Grodd gorilla army, Mister Mxyzptlk pops up from the fifth dimension and thinks it would be great fun to....

When a mysterious alien abducts Mr. Terrific, Batman, Luthor and two of the brainiest villains in the universe, he puts them to a test to discover who is the smartest among them.

When Firestorm discovers that League members have no memory of who they are, it's up to him to round them up in their secret identities and convince them they are superheroes.