Fairy Tail Episode 127, " The Terror of Invisible Lucy! ," is a standout filler episode where an expired potion turns Lucy invisible and causes her guildmates to forget her existence. The plot highlights the deep bond between the characters, as Natsu Dragneel's memory of Lucy ultimately breaks the spell and brings her back from the brink of disappearing, as detailed on the Fairy Tail Wiki and Anime And Manga Universe . For more details, visit the Fairy Tail Wiki. INVISIBLE LUCY! Fairy Tail Episode 127 Reaction + Review!