Cassie's real name is Cassandra Sandsmark. Her mother is the famed Archeologist Dr. Helena Sandsmark. She's a student at the St. Elias Academy For Girls in Gateway City. She is the president of the school's "Wonder Woman Fan Club." She only appears in Teen Titans Go! #54, but never in the animated series. She was a replacement sidekick for Wonder Woman when Wonder Girl left. This Wonder Girl wears the Gauntlet of Atlas, which allows her to lift great weights, and the sandals of hermes, which allow her to move at superhuman speeds and fly.
- She has recently been added as a new character in the Young Justice series.