The Johnny Carson Show presents; Joan Embery first brings out an 18-month-old gorilla. Next comes a striped hyena, followed by a Humboldt penguin, a warm-weather species. Next are a pair of three-month-old bushbabies, a primate. Finally she shows a tarantula and some large insects - a walking stick and a large millipede. Embery admits she doesn't like tarantulas. Wil Shriner does a stand-up comedy routine. Mary Gross talks about doing the Alfalfa character on Saturday Night Live, and a clip is s