One of Lynn's boyfriends in the second season. His nickname "Lizard" comes from his removing a tumor from a lizard in biology class. His true love is quantum physics. Willie is so pleased with this, that he preemptively gives "Lizard" permission to marry Lynn.
He got a job at the Weiner on a Stick restaurant at the mall, where Willie ate dinner on the night of its grand opening.
He appears on the episode "Some Enchanted Evening" in which he meets ALF at the Tanners' Halloween party. ALF asks him what he thinks extraterrestrials might be like. When he says that they would be very advanced and intelligent, ALF says "thank you."