S5E9 - "Good Luck, Ruth Johnson"
On this week’s 100th episode spectacular, Carter takes a very special guest on a tour of the hospital, Carol cares for a young boy whose story takes an extremely dark turn, Dr. Kotlowitz has Benton assist him with a cochlear implant procedure, Corday has her own mic drop moment at an M&M, and the writers continue to give Doyle nothing of value to do.