The Injustice League was a team of supervillains self-styled as the evil counterparts to the Justice League. In reality, the group was a proxy curated by the Light to misdirect the League from their true activities, which every member, except the Joker, knew going in.
Following the Brain's activities in Northern India on September 14, the Light required a scapegoat to blame their activities on, and rounded up seven super-criminals: Wotan, Joker, Poison Ivy, Atomic Skull, Ultra-Humanite, Count Vertigo and Black Adam.
When the Team destroyed their transmitter, a giant plant, the plants around the world were defeated and the Justice League was able to come in and help defeat the Injustice League. Most members were taken into custody at Belle Reve Penitentiary to Hugo Strange, with the exceptions of Count Vertigo, who had diplomatic immunity, 
A few members remained close associates of the Light, such as Count Vertigo, who trafficked meta-humans in Markovia on their behalf. Alternatively, Ultra-Humanite was admitted into the group's upper echelon.
The Joker, however, did not take kindly to being played as a patsy, so he concocted a hair-brained scheme involving the United Nations as payback against Vandal Savage and his colleagues. In response, they sent an operative to kill him.
- Season 1
- Season 4
- 07. "The Lady, or the Tigress?" (picture in a flashback)
- There have been three incarnations of the Injustice Gang. The first was led by the alien Agamemno and consisted of Dr. Light, Felix Faust, Catwoman, Penguin, Chronos, Black Manta, Mr. Element, and Sinestro. They switched bodies with the JLA to help Agamemno conquer the universe, but were sent to their original bodies and defeated. The second was mostly a "joke" group consisting of Cluemaster, Major Disaster, Clock King, Big Sir, Multi-Man, and the Mighty Bruce. They disbanded after joining the Suicide Squad, where, on their first mission, Big Sir and Multi-Man were killed (Multi-Man survived using his powers), while Clock King and Cluemaster were seriously injured. The third incarnation was a team of roughly sixty villains led by Lex Luthor, Cheetah, and the Joker. They were formed to destroy the JLA and actually managed to capture several members. Firestorm eventually freed his allies and most of the Injustice League was captured (many who escaped attacked Green Arrow and Black Canary during their wedding). All captured members were taken into custody by the Suicide Squad and sent to a desolate planet (as seen in the Salvation Run arc).
- Hopps, Kevin (writer) & Chang, Michael (director) (October 14, 2011). "Revelation". Young Justice. Season 1. Episode 14. Cartoon Network.
- Dubuc, Nicole (writer) & Berkeley, Christopher (director) (November 18, 2021). "The Lady, or the Tigress?". Young Justice. Season 4. Episode 07. HBO Max.
- Weisman, Jon (writer) & Cook, Victor (director) (March 10, 2012). "Coldhearted". Young Justice. Season 1. Episode 20. Cartoon Network.
- Weisman, Greg (2012-01-30). Question #14088. Ask Greg. Retrieved 2012-03-15.
- Robinson, Andrew (writer) & Zwyer, Mel (director) (January 4, 2019). "Royal We". Young Justice. Season 3. Episode 2. DC Universe.
- Vietti, Brandon (writer) & Berkeley, Christopher (director) (January 4, 2019). "Eminent Threat". Young Justice. Season 3. Episode 3. DC Universe.
- Weisman, Greg (writer) & Heuck, Vinton (director) (January 18, 2019). "Home Fires". Young Justice. Season 3. Episode 9. DC Universe.