The actor appeared on the chat show from his home in Wales as the BBC series went ahead in lockdown with guests including Michael Buble, Martin Freeman and singer Celeste.
Sheen’s section saw him play the game show host in promotion of the new ITV series Quiz, which tells the story of the infamous coughing scandal that saw Charles Ingram cheat his way to £1m in 2001.
Providing the audience with a dose of what to expect, Sheen hosted his very own version of the series – in character as Tarrant – with Norton as his contestant.
As well as assuming the role of Tarrant, Sheen attempted to sing the theme tune and nail the studio lights using a torch, which had both viewers and Norton – sat alone in his studio – laughing away.
After being asked how many sonnets William Shakespeare wrote, Norton decided to phone a friend (considering he couldn’t ask the audience).
That friend turned out to be Dame Judi Dench, who supplied him with the correct answer (154).
“Michael Sheen doing the Chris Tarrant voice and recreating Who Wants to be a Millionaire with a torch and handwritten questions on a piece of card has made the lockdown worthwhile,” one viewer tweeted
Another agreed, writing: “Michael Sheen pretending to do Who Wants To Be A Millionaire on the Graham Norton Show while doing his own music, graphics and lighting is my new favourite thing.”
One person praised the actor’s ”chaotic energy”, with another writing: “Appreciated the extra effort Michael Sheen has gone to in his Chris Tarrant impression,” adding: “Dedication.”
Quiz begins on Monday 13 April at 9pm on ITV