Cassandra "Cassie" Sandsmark was the second person to be called Wonder Girl. Cassie was the daughter of Dr. Helena Sandsmark and the Greek god Zeus. Cassie spent most of her time at her mother's place of work, the Gateway City Museum of Antiquities, where she had a penchant for getting into trouble. She quickly befriended her mother's new employee, Wonder Woman, and was eager to help her.

Age: 25

Hair: Blonde

Eyes: Blue