When the remains of a high-stakes gambler are found in an industrial shredder, Booth risks relapsing into his gambling addiction as he and Brennan delve into the world of underground poker. Meanwhile, Hodgins invents a new product related to the lab, and Brennan and Booth find out some exciting news.

When two New York City paramedics are killed during a kidnapping, Holmes and Watson join the manhunt to find the murderer and the woman he abducted. Also, Holmes learns important information about his recovery sponsor, Alfredo, that strains their relationship.

Derek witnesses a horrible car accident and springs into action to save lives.

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Louie runs into an old acquaintance.

Mary manages to align herself with France as the threat from England looms.

The team taking down B613 is in serious danger and forced to take drastic measures to ensure their safety. In the White House, Mellie is mortified when the nation turns against her and Cyrus is forced to come to her defense.

Wolowitz questions his engineering abilities when he and Sheldon can’t get a toy drone to fly. Meanwhile, a cancelled flight nearly prevents Leonard from giving the commencement address at his former high school, and Raj pits his parents against each other when his father cuts him off financially.

As Red fights for his life, he pleads with Liz to track down Nicholas Caul — a mysterious figure from his past with knowledge of The Fulcrum. It's a race against time for the task force to locate Caul before Red's life is threatened again, while Tom proves helpful in an unexpected way.

Chris Evans (Avengers: Age of Ultron (2015)); comedy troupe Monty Python (Monty Python: The Meaning of Live (2014)). Also: LunchMoney Lewis performs with The Roots.

Wrestling with whether or not to tell Elena about the cure, Damon brings up their future together and what life would be like if they weren’t vampires. Meanwhile, it’s all hands on deck when attempts to stop a humanity-free Caroline doesn’t go as planned. Elsewhere, when Bonnie discovers that Damon has betrayed her trust, she takes matters into her own hands, setting off a chain of events that leaves Damon dealing with the fallout. Lastly, after being forced to face his traumatic past, Enzo sets out for answers and is surprised when he learns the truth about the day he was turned into a vampire.

Season Finale: With one last chance to take Paris, Ragnar, and his Vikings troops take a daring chance. Ragnar asks Bjorn for a favor that could change the course of Viking history.