Troy Winbush

Sheldon and Leonard hire Professor Proton (guest star BOB NEWHART), the host of their favorite childhood TV show, to perform. Also, Howard and Bernadette run into trouble babysitting Raj's dog.

Kidd and Severide's honeymoon is interrupted by a dangerous person from their past; Kidd's former academy classmate joins Firehouse 51; Brett and Violet reflect on their relationships.

The doctors must race to save a girl caught in the crossfire of a shoot-out; Willis shifts his focus to field medicine, choosing to work primarily on an ambulance with his new partner, paramedic Rox; Leanne begins her journey to adopt Ariel.

Fitz and Mellie's children prepare for an interview; Adnan seeks Harrison's help; Rowan warns Olivia to stop investigating B613.

A catastrophic event forces Olivia to go back to work at the White House; the first few days of Fitz's presidency.

Olivia must protect a new client who is under investigation; Quinn runs into trouble.