[1] In "Underworld Unleashed", Earthworm sells his soul to Neron and gains a worm-like body that enables him to dig rapidly and control vermin.
[9][10] He later transforms into a monster using a chemical derived from the Man-Bat serum, Bane's Venom, and Poison Ivy's plants before being defeated by Batman and imprisoned in Blackgate Penetentiary.
[11] In "Forever Evil", Emperor Blackgate joins the Secret Society of Super Villains before being defeated and re-imprisoned.
Leonard "Lenny" Fiasco was a low-grade student during his high school years and classmate of Bruce Wayne.
[17][18] Eraser makes a non-speaking cameo appearance in The Lego Batman Movie as one of several villains recruited by the Joker to take part in his attack on Gotham City.
Erdel was a brilliant scientist who created a transmitter to communicate with other worlds, unintentionally transporting the Martian Manhunter to Earth.
[22] A woman of German accent, her age is never revealed, but in Greg Rucka's novelization of "No Man's Land" storyline she is said to be 12 years younger than Gordon.
[23] Sarah returns in Batman #458 (January 1991), where it is explained that she had married a New York cop who was killed during a drug bust.
Later, Sarah is fired from the GCPD by Krol, who is now "a lame duck" after recently losing in the mayoral election against Marion Grange.
Grange later re-instates James Gordon as Commissioner and also re-hires and promotes Sarah to serve as liaison between the GCPD and the mayor's office.
First appearing in Tales of the New Teen Titans #1, Ron Evers was the childhood friend of Victor Stone and grew up in the slums of New York City, which led him to become a criminal as an adult.
[29] Cyborg later removes Ron's cybernetic implants, after which he reforms and founds the Church of Anti-Technocracy, an anti-technology organization.