The Bizarro League, also known as the Bizarro Justice League, are the Bizarro version of the Justice League.
Bizarro stole Lex Luthor's imperfect Duplicator Ray to create a world of Bizarros. Some of these insane clones formed a Bizarro-version of the Justice League. This team enforced their twisted version of justice.
The Bizarro World was destroyed in Crisis on Infinite Earths along with the Bizarro League.
When the Joker got 99% of Mister Mxyzptlk's power as part of the Emperor Joker storyline, he recreated the Bizarro League and the Bizarro World. When the imp got his powers back, he kept the new "Bizarro World".
Under a blue sun, Bizarro gained "Bizarro Vision", allowing him to make imperfect clones of himself. Bizarro planned to destroy the Bizarro World to be the reverse of Superman (because Superman would never destroy a planet). In response, the Bizarro-Lex Luthor leads a revolt and unleashes Bizarro-Doomsday, but is unable to stop Bizarro from destroying Bizarro World.
A version of the Bizarro League called the Bizarro Super Friends appears in Super Friends #18, consisting of Bizarra, Bizarro, Bizarro-Flash, Batzarro, Bizarro Green Lantern, and Bizarro Aquaman.
The Bizarro League appears in ' episode "The Bizarro Super Powers Team", consisting of Bizarro versions of Wonder Woman, Firestorm, and Cyborg.
The Bizarro League appears in ', consisting of Bizarro versions of Batman, Wonder Woman, Green Lantern (Guy Gardner), and Cyborg.