Mary Marvel was one of three women masquerading as the anarchistic Joker.
Over a decade ago, Mary Marvel was a university student in New Atlantis. However, in some unknown way, she connected with millionaire Christy Xanadu and journalist Lori Lemaris. Together the three women created the heroic identity of the Joker, which they shared. Together, they helped the Joker to "do the work of three heroes." However, the Joker was powerless to stop the posthuman Superman from taking stewardship of the Earth and outlawing costumed vigilantes. Marvel stood with the Secret Six at Washington, D.C., and was captured by Superman during the fight. She was the first victim of the Superman's totalitarian methods: she was captured and psychically interrogated into revealing the identities of the Joker, then had her heart stopped.
- 9 Appearances of Mary Marvel (Earth-9)
- 2 Images featuring Mary Marvel (Earth-9)
- 1 Quotations by or about Mary Marvel (Earth-9)
- Character Gallery: Mary Marvel (Earth-9)