After becoming aware that her mother has tampered with her mind, removing certain memories, Wonder Woman has doubts about rejoining the team. She sets out to test herself, asking other JLA members to monitor her missions, to see if her memory loss has compromised her ability to fight crime. Ultimately, the labors are successful, and she is unanimously allowed to rejoin the League.

Aquaman dissolves the JLA and rewrites its charter to allow only heroes who will devote themselves full-time to the league. The new team initially consists of Aquaman, Zatanna, Martian Manhunter, Elongated Man, the Vixen, and a trio of teenage heroes Gypsy, Steel, and Vibe.

Warhawk, the son of John Stewart and Hawkgirl, first appeared in the Batman Beyond episode "The Call" (2000). He works with the new Batman as a member of Justice League Unlimited.

Vandal Savage has plagued the Earth with crime and violence since before the beginning of recorded human history.

Wonder Woman's earrings provide her with oxygen, allowing her to breathe in outer space. For a brief period in the 1970s, they also doubled as miniature grenades powerful enough to blast her way through a steel door!

Topo made his first appearance in Adventure Comics #229 and appears to be gifted with exceptional intelligence compared to that of an average octopus. He possesses superior dexterity and once demonstrated his skill with a bow and arrow.

Located on the outskirts of Gotham, Arkham Asylum is a psychiatric hospital where many of Batman's foes are sent for rehabilitation. Unfortunately, Arkham doesn't have a very good track record. Inmates escape on a regular basis, and those who are discharged often return to a life of crime.

Green Lantern's weakness is ... anything yellow. Because of a "yellow impurity" in the rings' central power battery, Green Lantern rings have no effect on anything of that color.

Despero forces Flash to play a game similar to chess in order to prevent the other members of the Justice League from being banished to other planets, but Flash is defeated due to Despero cheating with his third eye. Fortunately, the JLA is able to escape for a rematch.

In the Cry for Justice limited series, JLA foe Prometheus destroys Star City and kills Roy Harper's daughter. After Prometheus tricks the Justice League into releasing him, Green Arrow tracks him down to his hidden lair and kills him with a single arrow right between the eyes.