Callisto is a mutant in the X-Men series. A mutant with superhumanly acute senses, Callisto is a superb hunter and tracker. Callisto banded together unwanted mutants society didn't accept and lived underneath the sewers of Manhattan called the Morlocks. She then found Caliban a mutant with psionic abilities to locate other mutants, using that power Callisto gathered together many other mutants. Although deposed as the Morlock leader by Storm, Callisto has often been her ally. Since she was taken to another dimension by Mikhail Rasputin, Callisto has shown a maternal devotion toward the young Gene Nation member known as Marrow.