Roulette is a supervillainess in the DC Comics universe.
Roulette's grandmother was a Golden Age villain of the same name, who ran a conventional casino and fought Mister Terrific, as well as having a relationship with his brother, Ned. Both Ned and Roulette have been retcon into Mr. Terrific's history, and do not appear in the original stories. The current Roulette believes Terry Sloane to be her grandfather, rather than great-uncle, and sees the current Mister Terrific as an unworthy successor. Her casino ("The House") is a superhuman gladiatorial arena, capturing heroes with teleporter technology similar to Holt's T-Spheres, and pitting them against each other, while various supervillains bet on the outcome.
In her debut, she captured most of the current Justice Society and forced them to fight each other; Mr. Terrific and Dr. Mid-Nite were forced to play a chess game where the loser would be electrocuted, Sand and Hawkman had to reach Hawkgirl while infected with a fast-acting lethal virus (of which Kendra had enough of the cure for one) while Black Adam clashed with Atom Smasher.
However, all managed to escape their traps; Black Adam and Atom Smasher's fight lasted so long that the mind-controlling drugs used on them to heighten their hostility towards each other wore off, Sand remained in his earth form to slow the spread of the virus until another cure could be found by Dr. Mid-Nite, and Mr. Terrific and Dr. Mid-Nite managed to reach a draw in their chess game, and destroy it while the game re-set itself. Roulette teleported them away before they could capture her, however.
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Official Site: D.C Comics
Links: Wikipedia Un. Guide to the D.C Universe JL Watchtower