Spencer prepares for his first owners' meeting in the wake of an unexpected tragedy; Joe agrees to go on Ricky's radio show; Charles faces an unexpected health crisis during his busiest time.

Bob’s plan to surprise Linda for their anniversary gets tricky when the kids become involved.

When the brewery announces it will be firing one employee, Peter is nervous he will be the one let go; the family departs on a Yacht Rock cruise that doesn't go as expected.

Morgan is accompanied by the group when he embarks on a mission as he faces an unknown future; Al connects the pieces; June makes a promise with John.

Our heroes return to Ivory Quay, but the bone tree barbarian’s ancestral home has been warped, corrupted beyond recognition. The gang fights their way to the Beast of Beginning, disgusted and confused at the horrors their temporal tampering has unleashed.

Callen and Sam work with Navy Capt. Harmon Rabb, Jr. to apprehend spies aboard the USS Allegiance. Also, Hetty partners with Marine Lt. Col. Sarah "Mac" Mackenzie to neutralize a missile attack in the Middle East, and Kensi and Deeks are trapped in a mobile CIA unit in Iraq while under attack by ISIS.

In Montauk for work, Joanie becomes acquainted with EJ. Together, they explore Joanie’s family history, leading her to question the cause of her mother's death. Rattled, she starts to make some self-destructive decisions.

When a video goes viral of Bart and Homer fighting, they begin a journey as social media celebrities. Meanwhile, Lisa battles the school’s new industrialized detention system.