Mulder and Scully investigate the strange two-day disappearance of a Navy destroyer.
Mulder is taken hostage by a man who claims his boss is literally a monster.
Felicity turns to her father Noah Kuttler for help when Team Arrow gets wind of Damien Darhk's next move.
Daniel wages psychological warfare to flush out Zoe when he suspects her avatar is hiding in the Cylon; Joseph is guided to a nightclub in New Cap City that may lead him to Tamara; Vergis tries to drive a wedge between Amanda and Daniel.
A risky undercover mission at Brightborn proves to have several big surprises. Meanwhile, the discord between Sarah and Felix grows as she checks up on Adele.