Episode Title:Makes a Stink.Episode Description:Flora Whiff (Bebe Neuwirth), the famous expert on smell — whose "nose knows" — comes to school to judge the First Annual Smell Search. Ms. Frizzle's class creates a unique smell which is bound to take first prize, but Arnold's cousin, Janet (from Gets Lost in Space, Butterfly And The Bog Beast, Gets A Bright Idea, Works Out, and Gets Swamped), determined to win by herself, changes their smell to an odor only a skunk could love. The kids discover the secret to what makes things smell... now they have to make sure their creation doesn't make a big stink. Interestingly, Michael makes a cameo, since he didn't appear with Ms. Frizzle and her class.