Esme and her sisters approach the underground for help in stopping the Hound program, though they are doing so to support their agenda of rebuilding the Hellfire Club. The underground members refuse, while Reed and Caitlin decide to take their family to Mexico. They stop at another refugee base on the way, where they reunite with Wes. One of the sisters visits Andy, asking him to reconsider leaving. Another visits Polaris, and uses knowledge of her mysterious birth father—who once led the Hellfire Club—and her unborn baby to try manipulate her into assisting them. Turner and Campbell launch an attack on the Struckers’ location, using Hounds who can combine their abilities with technology developed from Lauren and Andy to start destroying the building and arrest mutants. Polaris, Blink, Eclipse, and Thunderbird arrive to rescue them, but only the intervention of the sisters allows them to successfully escape. The underground formally partners with the Hellfire Club, unaware that the sisters had given SS the location of the base.