Kevin goes on medical leave after suffering injuries at work, and his attitude toward Lucy changes drastically; Ruthie and Peter argue as they struggle with a difficult school project. Elsewhere, Rabbi Glass (Richard Lewis) tells Eric that he and his wife are splitting up; and a strange teen (Tyler Hoechlin) shows up unexpectedly at the Camden home. Rosina: Laraine Newman. Peter: Scotty Leavenworth. Kevin: George Stults.