Breaking Bad creator Vince Gilligan says it took him and his writers a year to decide how the show should end.
The final episode of the hit US drama is available to UK viewers from today (30 September).
The show recently won the outstanding drama prize at the Primetime Emmy Awards.
Vince Gilligan was speaking to Newsbeat reporter Nesta McGregor who started by asking him what he felt was the show's breakthrough moment.
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