History:

Wonder Girl is a precocious and outgoing 15-year-old named Cassandra "Cassie" Sandsmark. The daughter of noted archaeologist Helena Sandsmark and an unnamed father, Cassie became a super-hero over her mother's objections.

During a battle with a clone of Doomsday, Cassie "borrowed" the Sandals of Hermes and the Gauntlet of Atlas from Wonder Woman (who was not using them at the time), which imbued her with super-powers. Donning a wig and goggles, Cassie became "Wonder Girl" twice this way, helping Wonder Woman defeat the Doomsday clone and other menaces.

Later, having been summoned to Mount Olympus by the gods themselves, Cassie boldly stole a moment of Zeus's time and asked him to give her super-powers of her own. Zeus was so impressed by the girl's courage and brashness that he did just that - granting Cassie her "fondest wish." Returned to Earth with incredible super-strength and the power of flight, Cassie permanently assumed the role of Wonder Girl.

As Wonder Girl, Cassie trained alongside Wonder Woman and Artemis, learning a host of martial skills and how to better handle her powers. Wonder Girl soon joined the group of heroic sidekicks nicknamed Young Justice. A natural leader, the members of Young Justice often defer to Cassie's judgment, and Robin appointed her the team spokesperson.

Cassie continues to live in Gateway City, fighting crime alongside her Young Justice teammates, and has begun a search for her missing father.