A new patient exposes Arden's past; Kit learns why Grace was admitted to Briarcliff.

A murderous Santa wreaks havoc on Briarcliff; Sister Jude faces off with the devil; Arden has a shocking encounter in the death chute.

The Monsignor takes an unlikely convert under his wing; Lana secures a new piece of evidence that can exonerate Kit; Dr. Arden witnesses a miraculous return.

The Monsignor confronts the Devil. Dr. Arden’s experiments reach a shocking conclusion. Dr. Thredson facilitates a surprising reunion for Kit.

Grace tells Kit devastating news about the aliens' experiments on Alma; Dr. Thredson receives an unexpected visitor; the Monsignor goes to extreme lengths to silence Jude.