With all the adaptations and the upcoming Warner Bros. movie "Justice League," most have probably been acquainted with the members of the superhero team. In the comic books, however, the writers are known to spice things up and add a villain or two to the superhero-only team. Here's a list of popular DC Comics supervillains that you didn't know were part of Justice League.
Catwoman
Selina Kyle has been brought to life onscreen by various actresses and in various storylines, but her origin story has remained the same all throughout. She's grew up with a tough upbringing and resorted to a life of crime as she became older. She's a character that flip-flops back and forth-sometimes she's good, sometimes she's bad. At one point, however, she was good to the point of filling in for Batman in Justice League Canada.
Killer Frost
In The CW's "The Flash," viewers have seen how Killer Frost cannot be trusted. She's manipulative and cold-hearted. In the comic books, however, she's more of a character in the grey area and would only go to great lengths in order to find a cure for her illness. She found a place in Justice League when villain Eclipso had possessed the other members. Although Eclipso tried to do the same with Killer Frost, he was unable to do so due to Frost's strong willpower.
Prometheus
Prometheus was introduced as top villain in "Arrow" Season 5. According to Screen Rant, Prometheus killed Felicity's boyfriend, Oliver, forcing Felicity to undergo a drastic transformation in order to exact revenge.
The Prometheus in the comic books has been a member of Justice League ever since his youth. He was given the status of honorary member in the League.
Captain Cold
Although he was initially introduced as a baddie in "The Flash," viewers have seen the Captain Cold has a proclivity for goodness and being the hero. As a matter of fact, Movie Pilot reports he sacrificed himself in order to save the rest of Legends of Tomorrow. He became a member of the Justice League after he helped them fight the Crime Syndicate of America.
Lex Luthor
Superman's popular nemesis joining forces with him? Yes, you read that right. Together with Captain Cold, he helped the Justice League in the battle against the Crime Syndicate of America. The other team members reluctantly allowed Luthor to join. He remained a member of Justice League until the "Darkseid War" story.