The entire intelligence community is put in jeopardy when Remi co-opts an FBI case.

When New York City experiences a major blackout, cops scramble to contain the resulting chaos, and Frank uncovers some unpleasant truths about his department in the aftermath. Also, Jamie and Eddie question the line between work and their relationship, and Danny and Baez race to question the subject of a murder investigation before she gets tipped off by her ex-boyfriend.

It’s Halloween in West Covina – Rebecca enlists Paula, Heather and Valencia in a séance after making a spooky discovery.Meanwhile, Darryl takes his parenting duties to an extreme, while Nathaniel is determined to prove to his father that he can run the law firm.

MacGyver and Riley, with the help of Vasil, a distraught father, must find a way to drive a tanker filled with liquid oxygen through a region occupied by rebels and deliver it to a children’s hospital before they run out. Also, Riley helps MacGyver decide whether or not to allow his father back into his life.

Maya’s Halloween becomes truly terrifying when JJ attends a rave in the woods. Ray joins Dylan’s Halloween heist determined to prove he’s more than a do-gooder. Meanwhile, Jimmy and Kenneth turn the DiMeo home into the neighborhood’s haunted house.

Vanessa relives the memories of her ancestor, Lily Van Helsing, in Colonial Hong Kong. There, she learns to control her dark side and fights the B'ah, the second vampire Elder.

10K nearly loses everything as panic and anti-Talker sentiments flare after an explosion derails the vote.