Bentley was selected as the narrator of the UK version of Big Brother, which remains his best-known work. The producers of Big Brother gave him the job of narrator because they liked the way he said "Chickens". His most notable catchphrase is "Day (in the Big Brother house...)". Bentley has narrated all thirteen series of the show to date, as well as the spin-off shows Celebrity Big Brother, Teen Big Brother and Celebrity Hijack.
Despite having a low profile he has made some exceptions. On day 59 of Big Brother 2003, he was interviewed in the camera run by Dermot O'Leary on Big Brother's Little Brother and during Big Brother 2002 he was interviewed in the studio. On 13 August 2006, to accept his award as BBLB's employee of the week, the final one of the series, he chose not to appear in person but was interviewed unseen from within the BBLB studio with a voice over Dermot, the host. He made another exception on 28 January 2008, when he made the link to "Dermot's best bits" while being seated in the Hijacker Booth. His face remained unseen, as all lights were down in the Booth. As part of the running joke surrounding him, Bentley has occasionally been featured on BBLB reading a humorous script for the show, albeit filmed from a back view so as not to reveal what he looks like on the show itself. Bentley's voice also appeared in the fictional Big Brother based horror television series Dead Set.
On 23 May 2010, Bentley made an on-camera appearance in the final ever Big Brother teaser trailer. Bentley starred in it as a priest saying goodbye to Big Brother, as various old housemates such as Nikki Grahame, Nasty Nick and Brian Dowling danced and laid Big Brother to rest. On 28 July, (day 49) during Big Brother 2010 and as part of the "Ignore the obvious" task, he appeared in the house narrating scenes live with a microphone while bowling it around the house. The housemates were under instruction to not react to various unusual events, including Bentley's appearance in the house. His lines included "Some of the housemates are in the living room, passing round the Jaffa Cakes" and "Rachel is in the bathroom. Alone". He was also the voice of Titan the Robot during this series.
After the last episode of Ultimate Big Brother, a short video was uploaded to the official site. It showed Bentley walking out the house with a suitcase, looking up, and going "Day 1, of the rest of my life..." During the final Big Brother's Big Mouth a short film was made showing Marcus comically holding a family hostage after Big Brother had ended, so that he could continue to narrate people's lives.
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