Despite Ralph's best efforts, Rosso drains his blood. Frost gets him back to S.T.A.R. Labs, where Barry gives him a blood transfusion. However, a small trace of Rosso's blood enters Barry's bloodstream; causing him to pass out. The Speed Force, in the form of his mother Nora, tells him that Rosso's blood contains his consciousness and is slowly infecting him as well as grants him access to Barry's mind; including knowledge of his secret identity and impending death. Using his memories against him, Rosso tries to convince Barry to join him; promising him the power to avert not only his death, but countless others. The Speed Force tries to argue Barry out of it, but accidentally provokes him when he realizes he was their pawn and he will never get what he wants while serving it. Cisco and Frost eventually revive Barry, but when Iris comes to check on him, she quickly realizes it's not him. Fully infected, Barry attacks his friends and reports to Rosso, who's ready to enact his masterstroke as Bloodwork. Elsewhere, Iris, Kamilla, and Allegra investigate the organization that turned Esperanza into a killer. They learn the group's name, Maelstrom, but their only other lead is mysteriously killed.