The line comes from the Doctor Who finale Doomsday in 2006, spoken by a Dalek to the Cybermen when they suggest joining forces against humanity. The Daleks reject the offer outright, treating millions of Cybermen as a minor infestation rather than an equal army. Clips of the exchange circulated on forums and video sites as Doctor Who memes grew, and the single sentence was later isolated for soundboards. It remains popular because it captures pure, arrogant dismissal in a few seconds that still works far outside its original science fiction context.
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Dalek voice clip from Doctor Who saying this is not war, this is pest control, used for confident takedowns, roasts and meme video edits online.
A single Dalek delivers the line in a harsh, metallic voice, flattening the threat in front of it into something beneath contempt. The delivery is cold, clipped and completely certain, with that familiar electronic rasp turning a simple insult into a declaration of total superiority. There is no anger or panic, just calm dismissal, which is what makes it so cutting. Played over a mismatch or an easy win, it instantly reframes the other side as an annoyance to be cleared away rather than a rival worth respecting, and the joke lands before anything else happens.