Thunderbird coordinates a mission to discover what Sentinel Services had done to an old friend of his and Lauren encounters a new friend with useful powers.

Eclipse's ex-lover returns; Reed and Sage find alarming information about Lauren's new friend; Thunderbird helps Blink open up about her past; Jace approves a special surveillance program.

As tensions heat up among the team at Mutant HQ, no one knows who they can trust. Fearing for his family's safety, Reed rethinks their future at the compound. Meanwhile, Dr. Campbell proposes an improved program to Jace that could change everything.