After breaking out of his confinement, Charlie cuts the ship’s power once again and embarks on a murderous rampage. As Olivia finds herself one step closer to Rachel, Gloria pulls away from Wilde.

After another scientist turns up dead, the mole reveals their true identity – and asks for a favor in return.

As the Alexandria threatens to explode, the remaining scientists jump ship and onto the only life boat – putting them face-to-face with the real killer.