The Fatal Five are fictional characters, a supervillain team of the 30th century in the DC Comics universe. They were created by Jim Shooter and first appeared in Adventure Comics #352 (1967) as enemies of the Legion of Super-Heroes.
Originally a gang of super-criminals assembled by the Legion of Super-Heroes to help them destroy the Sun-Eater threatening Earth, the Emerald Empress, Mano, The Persuader, and Validus, led by Tharok, subsequently clashed with the Legion many times.
A later incarnation consisted of the Emerald Empress, Persuader, Flare, a Rimborian with the power of fire, Caress, who had a deadly acidic touch and Mentalla, a Legion reject who was secretly working against the Five trying to secure a spot in the Legion.
The first storyline in Legionnaires (1993) had the SW6 Legion face a Fatal Five comprising Tharok, Mano, the Persuader, a new Emerald Empress and a monstrous being called Mordecai.
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Official Site: D.C Comics
Links: Wikipedia Michael Kooiman web page SpiderBob.com