Ellen Patrick is a wealthy California socialite and the daughter of Owen Patrick. In life, Owen Patrick was one of the few honest politicians in California. Then corrupt politicians murdered Owen Patrick and walked free of the courts. Now Ellen Patrick lives a double life as the masked vigilante called "The Domino Lady". As the Domino Lady, she wears a Domino mask and fights criminals and crooked officials. She robs corrupt officials and criminals, keeps some of the loot for herself and secretly donates the rest to charity. By using stealth and seduction, investigation and weaponry, Ellen Patrick defeats villains as the Domino Lady.

Ellen Patrick is 5 foot, 7 tall and her measurements are 38D-23-39. She is curvy and has long blonde hair, brown eyes, plump lips, long legs and tanned skin. As the Domino Lady, she uses a wide array of firearms and knockout drugs. Whenever possible, she uses seduction to lure her foes into a false sense of security, before subduing or killing them. Domino Lady also excels in unarmed brawling and melee weapons usage. As a master detective, she's skilled in using analysis and observation. All these traits make her an alluring and capable heroine.