Channel 4's televised profile of Paedophile Hunter Stinson Hunter will show the moment he exposes a potential online paedophile after posing as an underage girl.
The 31-year-old vigilante, whose real name is Keiron Parsons, leads a team of adults dedicated to entrapping men and women who target underage boys and girls using chatrooms.
The show has come under fire from police forces who say it is but the documentary makers claim their actions result in more convictions of paedophiles for online offences than racked up by official authorities.
Mr Hunter, from Nuneaton in Warwickshire, and his team will be shown on the film confronting those who are caught out on their way to meet a boy or girl.
The programme makers also say they hope the film will highlight the lack of resources available to some forces to monitor online grooming.
The Paedophile Hunter will be shown on Wednesday, October 1 at 10pm on Channel 4.