The hero known as Secret was once an ordinary girl named Greta Hayes. She was murdered by her adoptive brother, Billy, who would later become the supervillain known as Harm. Because of the manner of her death, Greta remained stuck on this plane of existence, a gateway between the living and the dead.
In her first appearance, Secret was being held against her will by the DEO. Robin, Impulse, and Superboy helped her to escape, and were able to convince her to join their crimefighting team, "Young Justice," at the same time as Wonder Girl and Arrowette. Being incorporeal, Secret is able to take on a variety of appearances, and is referred to as "the mist girl" or "the bottle girl" by the various agents who pursue her throughout her career.
Her brother Billy assumed the villainous identity of Harm and attacked Young Justice, but died when his own father shot him. Billy returned during the events of "Day of Judgment," when the entirety of Hell had been evacuated. He again battled the team, using the substance of Secret.
Before her real name was known, Secret was often referred to as Suzie. Secret became good friends with the two girls, and was often portrayed as shy. For awhile she nursed a crush on Robin, and often defended his actions and followed his leadership unquestioningly. She also often expressed jealousy of Spoiler, Robin's girlfriend, to the point where the pair of them once had a full out battle across Gotham City, only stopped by the combined efforts of both Red Tornado and Robin.
During the Sins of Youth event, a temporarily adult Secret, with the aid of Deadman, chased down Klarion the Witch Boy's cat familiar Teekl, as Klarion had been overtly threatening them. Surprising her age-altered friends, she caused Klarion to back down by threatening to kill Teekl. When undoing everything he had done, Klarion insisted that it was everyone or nothing. Secret didn't want to change back to a kid, but was persuaded to by Robin, who promised to always be there for her. As predicted by Merry Pemberton, this would later cause many problems. Secret would even go so far as to physically threaten Spoiler.
At one point Hal Jordan, the Spectre, tried to mentor Secret. During this time, she visited her father in jail. Under the mental influence of "Billy," her father rejected her, leaving her more despondent than before.
Secret eventually gave in to the darkness in her nature at the behest of Darkseid, whom she mistakenly referred to as "Doug Side." During her time on Apokolips, Billy possessing her father, launched the body into one of the firepits, killing them both. Although Hal Jordan offered to step in and save Greta, as well as the world, the current Young Justice team advisor, Snapper Carr, rejected the offer, preferring that the kids use Secret turning evil as a "learning experience." Robin was eventually able to talk her down by himself. Towards the end of Young Justice, a disgusted Darkseid stripped Greta of her powers, and left her an ordinary, living girl, which was, ironically, just what she had always wanted to be.
Greta now attends the Saint Elias School for Girls, with schoolmates Cassie Sandsmark (Wonder Girl) and Cissie King-Jones (the former Arrowette).
- Teleportation: Secret had the ability to "smoke jump", teleporting herself over short distances. She could also transport others through the mysterious realm known as the "Other Side".
- 93 Appearances of Greta Hayes (New Earth)
- 33 Images featuring Greta Hayes (New Earth)
- 4 Quotations by or about Greta Hayes (New Earth)
- Character Gallery: Greta Hayes (New Earth)
Young Justice member