Undercover Boss is a British reality television series. Each episode follows a person in a high management position at a major business who poses as an entry-level employee to find faults in the company. The first series, consisting of two episodes, aired in 2009; the second series, with six episodes, aired one year later. This original series sparked the Undercover Boss franchise. Localised versions have been produced in the United States, , Australia, , Canada and various other countries. In June 2021, it was announced that it would be revived on ITV after a seven-year absence. Retitled Undercover Big Boss, it premiered on 5 August 2021, with four episodes.