Scarecrow appears in 1052 issues.
The inmates of Arkham are deemed too insane and dangerous for regular prisons. Although usually at each other's throats, the inmates will occasionally band together to take on their greatest foe - Batman.
The Arkham Staff are the medical and security staff that work at Arkham, to help the inmates and keep them secure and safe.
Members of Dark Arcana from Trinity series.
The Rainbow Rodeo created a backup team called the Deputy Lanterns to aid in Blackest Night. They consisted of various heroes & villains from Earth.
Professor of psychology
The Injustice Gang formed by Lex Luthor and six other of the world's most deadliest super-villains bent on destroying the JLA and dominating the world!
INJUSTICE LEAGUE UNLIMITED
A new league of almost every nemesis of any member of the Justice League, so far not much is known of this team besides their membership.
The scarecrow is an expert on the psychology of fear an emotion he turned into his weapon by creating fear inducing toxins that cause his victimes to hallucinate with horrifiying images.
A society of supervillains that has, over the years, featured a number of top villains that have on numerous occasions battled the Justice League, the Secret Six and lone heroes. In pre new 52 they were formed by Darkseid to take over the world but they had other plans.
The Sinestro Corps is a mirror organization to the Green Lantern Corps. Its members are chosen from those who can instill great fear and are given Qwardian Yellow Power rings. They are considered to be the evil equivalent of the Green Lantern Corps.
An evil and dangerous organization aim to conquer the world. The organization believes the world should have a two party system: the masters and the slaves. They are enemies of U.N.C.L.E.
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