members of X-Cell, a group of mutants who hold the government responsible for their power loss. When Quicksilver offered to repower its members, she warned Marrow about what happens to non-Inhumans who gain power from the Terrigen Mist. She and Marrow later fled into the sewers to escape the government. Return to the sewers At some point, Callisto returned to the sewers, this time alone. However, she is later discovered by various teen and young adult runaways, who she begins to care for, though with a firm but caring hand. Storm later stumbles upon this group while investigating one of the young girl's disappearance. Storm and Callisto let old feelings surface and the two fight. However, when Storm sees the girl helping Callisto, she realizes that the girl is there by choice and the hostilities cease. Storm helps them clean up. Before leaving, Storm offers Callisto to send regular help should they need it. At the time when the Terrigen Cloud was loose on Earth infecting mutants with M-Pox since the Infinity storyline, the number of mutants that are living underground had increased as Callisto also showed sympathy towards the humans who sought out refuge from the global landscape. As a way to live out the dream of Professor X, this unified society of humans and mutants lived together as the New Morlocks. But her little community soon came under assault when morlocks infected by a type of psi-vampirism attacked them while Monet and a morally inverted Creed stayed down in their territory to suss out the source of a new mutant sickness. As it happens the perpetrator of the underlife abductions was none other than M's brother Emplate, whom was suffering as much from the M-Pox epidemic as everyone else since it was killing off his only food supply. Callisto and Sabretooth attempted to fight him off and free the captured morlocks but were quickly incapacitated by the mutant leech. X-Men: Gold Callisto would soon find herself incarcerated at a new superpowered prison for homo superior, despite not being a mutant anymore due to Decimation. She would become an inmate at the 'Robert Kelly Correctional Facility'; also known as The Box, whilst playing gopher to the other inmates. At first attempting to become top dog while jailed at the mutant's only penitentiary, she was soon reminded of her place when a burlier convict had lain her out for thirty