The Daleks first appeared in Doctor Who in 1963, created by writer Terry Nation for the BBC series. Designed as emotionless alien mutants inside armoured cases, they became the Doctor's most famous enemies, recognised by their staccato electronic voices and their single command to exterminate all other life. Decades of television episodes, films and parodies have kept the catchphrase in popular culture. Online, short Dalek voice clips are shared as reaction sounds and edits, with screaming versions used for comic overreactions, defeats and chaotic battle moments.