Reeva Payge purges the Inner Circle of those who disagree with her, leaving her completely in charge. Then, fast-forward six months, when the Mutant Underground saves a girl, but not her family, from a Sentinel raid. Against the group's wishes, Eclipse and Caitlin meet with a criminal hacker to get info on the Inner Circle. Meanwhile, Polaris prepares for the birth of her baby, her contractions magnetizing anything metal and wreaking havoc. She also makes Andy promise to save the baby, no matter what.
The lives of an ordinary suburban family change course forever when they discover their children have developed mutant powers. When the threat of a hostile government forces the family to go on the run to protect themselves, they join the ranks of an underground network of mutants. Together, the group fight to survive in a world where fear and misunderstanding put them at constant risk.