'The Blacklist' Finale Sneak Peek: Ressler Is Dead-Set on Capturing the Man Responsbile for Liz's Death (Exclu

The season 9 finale airs Friday at 8 p.m. ET/PT on NBC. In 'Marvin Gerard: Conclusion Pt. 2,' Red and Cooper square off with conflicting endgames for their mutual traitor. A major secret about the Task Force falls into the wrong hands.