The actors, along with Josh Hartnett, Kit Harington, and Chiwetel Ejiofor, are set to take part in The Children's Monologues show, which comprises of solo pieces based on first-hand accounts from young children growing up in the rural township of Rammulotsi in South Africa.

The production is directed by Slumdog Millionaire moviemaker Danny Boyle, who launched the project to raise awareness and boost donations for Dramatic Need, a charity which provides arts education to vulnerable children in South Africa and Rwanda.

"The stories are shocking," Danny tells Britain's The Guardian newspaper. "You don't always want to know these things are going on in the world, especially to children, but when those actors get up on stage in London it will mean that another thousand people hear those stories, and that those kids really have a hell of a voice."

"I think it's a really effective project, letting actors who people really respond to give a voice to these children who we would otherwise never hear," Josh adds.

"There's something about the way children see the world that can lead to some of the funniest, most provocative and evocative work because it is unencumbered by years of cynicism."

The show, which also features live music from FKA Twigs, is due to take place at the Royal Court Theatre in London on 25 October (15).

Danny first put on a different version of the show in 2000 with Benedict, Tom Hiddleston and Eddie Redmayne.