"Who is Superwoman?" part 3! Supergirl continues her manhunt for Reactron, determined to bring him to justice for the heinous crimes he committed in "New Krypton"! Meanwhile, Lois Lane and Inspector Mike Henderson investigate the appearance of a dead body in Metropolis Harbor. Whose body is it and what could it have to do with the new Woman of Steel? Find out as the big mystery of 2009 continues!