Billionaire Bill Gates is to guest star in an episode of sitcom phenomenon The Big Bang Theory

Entertainment trade website Deadline reports that the Microsoft founder will guest star as himself in an episode which will air in the US next month.

In the episode, the philanthropist makes a visit to Penny's (Kaley Cuoco) workplace - and the Big Bang boys will do anything to meet him.

Gates also appeared as himself in Frasier in 2001.

The Big Bang Theory, Thursdays, RTÉ2, 7:00pm