Dr. Jamison misinterprets a rush call to the children's zoo, believing his patient is a child, and runs into a series of misadventures with a chimp.

Dr. Sean Jamison discovers that kicking a bad habit can have humorous as well as frustrating results. Sean finally convices Alfred's father to set a good example and stop smoking. Then he has to kick the habit himself when some of his little patients stage a smoke-in.