In this season it is revealed Marvin Marsh suffers from Alzheimer's disease, as demonstrated when he still believes Shelley is a baby in "Cash for Gold". It also features appearances from Jesus in "Butterballs" and Mr. Hankey in "I Should Have Never Gone Ziplining", though the latter does not speak, for the first time each since season fourteen's "201". Mr. Kitty also reappears in "Faith Hilling", having last appeared in "Major Boobage". Clyde's mother Betsy Donovan dies in "Reverse Cowgirl", but is seen alive in "Jewpacabra". "Jewpacabra" also features Cartman's apparent conversion into Judaism at the end, and only a fleeting appearance from Stan with no dialogue...