Borderline is a British mockumentary television comedy series devised by Michael Orton-Toliver and Chris Gau. Narrated by Ralf Little, the series launched on 2 August 2016 on Channel 5. The series follows the activity of a borderline agency working at a fictional airport known as ‘Northend Airport’. The series is "Retro-Scripted" in which a pre-written script is not produced and then acted out but instead a plot outline guides the cast as they improvise their dialogue and action scenes.