In 1988, Listerine unveiled their Ghostbusters-like troop of bad breath fighters, the Listermen. They make their first and I believe only appearance in a commercial for a better tasting version of Listerine, Listermint. In the ad, a couple are enjoying a bubbling hot tub. Things are looking to get romantic, but unfortunately the guy in the tub suffers from severe halitosis. Not only is it killing the mood in the tub, but it is bad enough to warrant a call to an elite hi-tech bad breath fighting force. The Listermen show up and go right to work. First blasting the guy in the mouth with their Listerbeam ray gun.