Neil and Grace deal with the fallout from their secrets and Adriana is startled by a new arrival.
After a massive attack on the angels, Castiel reaches out to Sam and Dean for help.
Castiel captures one of Metatron's angels and asks Sam and Dean for help with the interrogation - Dean eagerly accepts, which doesn't go unnoticed by Sam.
Dean struggles with the after effects of the Mark of Cain, while Sam hears about a case where straight-laced people are turning into violent murderers.
Kensi goes undercover as a nutritionist and Deeks poses as a new patient at a rehab center to investigate the death of a Navy officer. William Russ guest stars.
Rigsby and Van Pelt go undercover as a couple with relationship problems to investigate the death of a woman who received advice from a radio love doctor.
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