Some of these insane clones formed a Bizarro-version of the Justice 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.
So the Bizarro-Lex Luthor led a revolt and unleashed the juggernaut Bizarro-Doomsday.
The BL stopped the juggernaut by dropping a steel drum on him.
All of them, except Bizarro Green Lantern (the reverse of John Stewart), were based on the Silver Age versions of the characters.