Christopher Allen

Jarvis' quick thinking and precision is put to the test; Peggy has to stop an atomic explosion that could destroy California.

While Peggy plans a rescue mission, Whitney searches for more dark power; Jarvis learns not to make promises he can't keep.

Jess is nervous about starting her new role as principal, so Nick and Schmidt take her on a relaxing day trip to Solvang; Cece helps Winston try to finalize his divorce from Rhonda.

Emily strives to clear Jack's name in and out of court; Louise and Nolan are visited by officer Ben Hunter.

Kidd, Seager and Carver investigate a fire at the city stables. Kylie clashes with some of the firefighters over changes due to budget cuts. Herrmann struggles to keep it together as Cindy’s condition worsens.

A familiar face returns to Firehouse 51 to serve with Kidd on a special task force. With Tony days away from breaking the CFD’s perfect attendance record, Mouch and Capp work to keep him safe. Old memories and grudges resurface when Gallo reunites with a family member.