on the channel laSexta, where it premiered on 3 April 2014 under the title El jefe infiltrado. United Kingdom The original UK series, produced by Studio Lambert, started airing on 15 June 2009 on Channel 4 and ended its sixth and final series for the broadcaster on 20 August 2014. In 2021, Studio Lambert put a new series of Undercover Boss in to production, with the rights to broadcast the series moving over to ITV. The new series titled Undercover Big Boss, consisting of four episodes premiered on 5 August 2021. United States The first episode of the US series, also produced by Studio Lambert, premiered on 7 February 2010 after Super Bowl XLIV and featured Larry O'Donnell, then-President and Chief Operating Officer of Waste Management, Inc. On 9 March 2010, CBS announced it had commissioned Undercover Boss for a second season. On 28 July, CBS announced four company executives from NASCAR, DirecTV, Chiquita Brands International, and Great Wolf Lodge, Inc. had signed up for the second season of Undercover Boss. The second season opener was the Choice Hotels CEO, Steve Joyce on 26 September 2010. The series was a ratings success for the network, with its premiere episode receiving 38.6 million viewers and a share of 32%. The first season was the most popular new show in any genre in the 2009–10 television season with an average audience of 17.7 million viewers. CBS's premiere of Undercover Boss on 7 February 2010, immediately following the network's coverage of Super Bowl XLIV, delivered 38.6 million viewers—the largest audience ever for a new series following the Super Bowl since the advent of people meters in 1987, the largest audience ever to watch the premiere episode of a reality series, and the most watched new series premiere overall on television since Dolly on 27 September 1987 (39.47 million). It was also the third largest post-Super Bowl audience behind Friends Special on 28 January 1996 and Survivor: The Australian Outback on 28 January 2001. Repeats of Undercover Boss were picked up by TLC, beginning 25 July 2011; and OWN: Oprah Winfrey Network, beginning Fall 2012. TLC also picked up selected episodes of the UK, Canadian and Australian versions, which aired as Undercover Boss: Abroad; this series debuted on Monday, 13 February 2012, with TLC broadcasting the series most Monday nights, and OWN airing the series on Tuesday nights beginning 13 March 2012. The fourth