Nora grapples with a major revelation; the team must stop Weather Witch from partnering with a new meta-tech villain. (Read preview.)

In an episode directed by Rocky Carroll, Gibbs joins an old family friend — Army Corporal John Sydney (Buffalo Bill‘s Dabney Coleman) — on a road trip.

Jude (The Fosters‘ Hayden Byerly) visits and convinces workaholic Callie to attend a party at The Coterie, much to Mariana’s delight. (Watch sneak peek.)

In Season 1’s penultimate episode, Ben offers to give Mark free piano lessons; Jackie throws Becky a baby shower. (Fall behind? Read Episode 9 recap.)

In an episode that was supposed to air last week but was preempted by Trump…. Maggie and OA search for a killer after a judge and her daughter are murdered.

The Frost Sisters attempt to intervene when Lauren and Andy continue to disagree in their dreams.

Reboot premiere: A biomedical researcher (Grey’s Anatomy‘s Jeanine Mason) returns to her hometown, where she discovers that her teenage crush (The Originals‘ Nathan Parsons), now a police officer, is also an alien. (Watch trailer.)

The team attempts to take down a secret group of ex-Intelligence agents and avenge the death of Pride’s father.

Revival premiere: Four couples find their relationships tested by 24 sexy singles on the Hawaiian island of Maui; Mark L. Walberg returns as host.

Season 6 premiere: We begin with an Are You Afraid of the Dark parody, starring Evan Rachel Wood as Mary Shelley, Elijah Wood as Percy Shelley, Seth Rogen as Dr. Frankenstein, Will Ferrell as Frankenstein’s Monster and Jack McBrayer as Lord Byron. (Watch trailer.)

Final/season 3B premiere: A new neighbor (and his pet grizzly!) move in across the street from the school. (Watch trailer.)

Season 2 premiere: Matt has a crush on new coworker Jessica (played by SNL alum Sasheer Zamata). (Watch sneak peek; find out how to catch up!)

Fallon heads to Puerto Rico for an episode that celebrates the spirit and culture of the commonwealth amid efforts to rebuild following Hurricane Maria; Lin-Manuel Miranda and the cast of Hamilton perform.