Amy returns from maternity leave. Jake and Rosa work a difficult case.

The squad takes Holt up on an offer for a weekend getaway.

Approximately three months later, the U.S.S. Cerritos is dispatched on a mission where it ends up in a sci-fi event resulting in "strange energy," which Commander Ransom inadvertently absorbs.

Jimmy celebrates 1,500 episodes of The Tonight Show before catching up with Kit Harington and Miranda Cosgrove and enjoying a performance by Duran Duran.