When Stan ends up at PETA's compound for animals after being banished from South Park for refusing to vote, he says he wants to stay with them. However, the main leader of the group says that Stan has to get permission from Dr. Cornwallis to stay there. As he goes into Dr. Cornwallis' tent, it turns out Dr. Cornwallis is actually a goat shown munching on hay. Despite the goat not saying anything, Stan claims he said he can stay.
Later on, Dr. Cornwallis is seen munching on the brain of a dead PETA member after P. Diddy and his friends shoot up the compound.
Dr. Cornwallis takes the appearance of a usual goat, with white colored fur, brown horns, and crossed eyes.