Professor Yana first appeared in the 2007 Doctor Who episode Utopia, where the kindly scientist was revealed to be the Master, with Yana standing for You Are Not Alone. Murray Gold's score for the series gave that reveal a distinctive musical identity, and fans later lifted the cue onto soundboards and video edits as shorthand for a hidden villain or long-awaited return. It remains popular because the twist is one of the show's most quoted reveals, and the music alone can signal to other fans that something familiar is about to change.