“Hepatitis and Lemon Zest” — Bonnie (Allison Janney, right) and Rosco (Blake Garrett Rosenthal, center) get an unexpected visit from Christy’s landlord, Mr. Perugian (Jonny Coyne, left), on the season premiere of MOM, Monday, September 29 (8:30-9:00 PM, ET/PT) on the CBS Television Network.