The line comes from Breaking Bad season 4, episode 6, 'Cornered', first aired in 2011, in a scene between Walter White, played by Bryan Cranston, and his wife Skyler. Walter is rejecting her fear that he could be killed by rivals, insisting he is the threat others should fear. The quote quickly escaped the show through clips, quote posts and edits, becoming one of the series most quoted lines. Edited versions shorten the exchange to the central declaration, which is why it still works as a standalone dramatic moment online.