Crime Syndicate [Atomica [Rhonda Pineda] (Earth-3, villain); Deathstorm (Earth-3, villain); Johnnie Quick (Earth-3, villain); Owlman (Earth-3, villain); Power Ring (Earth-3, villain); Superwoman (Earth-3, villain); Ultraman (Earth-3), villain];
Flash [Barry Allen] (cameo flashback); Mr. Freeze [Victor Fries] (cameo, villain); Penguin [Oswald Cobblepot] (cameo, villain); Riddler [Edward Nygma] (cameo, villain); Secret Society (villains)