Marvel Maid was a superhero operating on Terra. She was a survivor of an underground civilization which was destroyed, and so gained incredible powers and became a superhero on Terra. She was the equivalent of Supergirl, bearing many similarities to her. Her base of operations was the orbiting Fortress of Marvels, and her home city on Terra was Macropolis. Her cousin, Marvel Man, was her partner. ("The Second Supergirl!")