A teen suddenly shows up at FBI headquarters with a large bag of fentanyl, seeking the team's protection from the men who murdered his father. Also, Nina (Shantel VanSanten) comes to Scola (John Boyd) with a proposal he is hesitant to accept in the new episode "Fortunate Son." Missy Peregrym, Zeeko Zaki, Jeremy Sisto and Alana De La Garza also star.