Mr. Wilford arrives and threatens Snowpiercer, so Melanie makes a move that can’t be undone.

Mary seriously considers giving up her operations for good.

Mary must make a deal with the devil in order to save her family and career.

Ryo takes a hostage to trade for the Blink Drive, but his former crew are not his only opponents.

While Sarah and Kira spend some well-needed bonding time at home, secrets are unlocked about Kira’s special gifts that are surprisingly linked to the island’s creature. Meanwhile, Cosima joins Delphine…