User blog comment:Xandermcc/Next Crossover Theory/@comment-1330227-20170709190041

I like the Crime Syndicate idea but I don't like your characters. They should be versions from a different earth. Maybe Earth-13 (since Earth-3 is Jay Garricks earth and 13 being a darker number because of Friday the 13th).

Maybe on that Earth Barry turned evil because of his dad's death and mom's imprisonment and being taken in by someone evil instead of Joe. They would have a character similar to Reverb. Or, maybe just use Johnny Quick.

It could be like how on Earth-2 Robert Queen survived and became the Green Arrow but on this earth he turns evil instead. The disappearance of her father and brother drove Thea to become evil. Black Siren could just join the Crime Syndicate.

Instead of Kara, a different Kryptonian kid was sent to earth and became evil (maybe UltraWoman). Martian Manhunter's double could be a White Martian that survived the Green Martians exterminating his race.

When his fiance died, Ray Palmer decided to try to take over the earth. Instead of Ronnie disappearing, Stein disapeared and Ronnie combined with that Tokamak guy. Maybe this earth has a Black Siren too and Dinah and Sara can both face the two evil Black Sirens.