Instinct — [s4e15]

: H.G. Wells, working undercover as forensic tech "Emily Lake," notices Purcell's physical features (like hair on his knuckles) shifting and disappearing in front of her eyes.

: Artie, Steve, Claudia, and Abigail work to stabilize the facility. [S4E15] Instinct

If you were looking for a different "Instinct" episode or a specific plot point, let me know! I can also provide: : H.G. Wells