Tensions within the Inner Circle are at an all-time high, as Andy comes to Rebecca's defense against Reeva. After making an important discovery about Dr. Risman's research, Lauren convinces Reed and Caitlin that they must take action to destroy it. Frustrated with not being taken seriously, Jace begins to strategize with the Purifiers. Meanwhile, the Mutant Underground continues to work on saving mutants. However, tensions flare between Blink and Thunderbird as they confront their differences.
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.