Daleks are the long-running alien villains of the BBC science fiction series Doctor Who, first appearing in 1963 and known for their armoured casings, emotionless logic and harsh electronic voices. Clips of their speech circulate online as reaction sounds because a single line can convey total indifference without explanation. This phrase is shared by fans and editors who use Dalek dialogue to dismiss human ideas, beauty or nuance, and it remains popular alongside the species' better known exterminate catchphrase in memes and fan edits.