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Walter Hartwell "Walt" White, Sr., also known by his alias Heisenberg, is the main protagonist of the crime drama series Breaking Bad and a minor character in both El Camino: A Breaking Bad Movie and Better Call Saul.
A brilliant but underachieving chemist working as a high school science teacher, Walt is diagnosed with terminal lung cancer, which spurs him on to use his chemistry knowledge to cook and sell crystal meth to provide for his family after his imminent death.
As the series progresses and he becomes more involved in the drug world, the formerly mild-mannered and unassuming teacher gradually becomes a ruthless criminal driven more by ego and greed than his stated altruistic motives, this way becoming the main villain of the series. He serves as the former teacher/meth partner of Jesse Pinkman, the archenemy of his brother-in-law Hank Schrader, and the arch-rival and competitor of Gus Fring.