Miss Hart was the headmistress of the Midvale Orphanage. She kept a close eye over one of her more infamous charges, Supergirl.

  • This version of Miss Hart (Earth-One), including all history and corresponding appearances, was initially erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. However the ending of Convergence retroactively prevented that collapse, saving all the alternate realities, though in an "evolved" form. Even though versions of the character may have since appeared, this information does not apply to those versions.