We last saw Lena Headey parading naked through Westeros in one of Game of Thrones’ most controversial scenes to date.
But the Cersei Lannister actress is swapping evil schemes for children’s television and will play a secret agent in kids’ cartoon Danger Mouse.
She will voice the character of Jeopardy Mouse, an American spy, a new version of the classic cartoon.
"I wanted to do it because it was pure nostalgia for me. I have children now and it's just a treat to be involved in something that you loved as a kid and be able to share it,” Headey said.
"Those moments as an actor that come along once in while are not to be missed."
She will appear alongside talk show host John Oliver who will play mad scientist wolf Dr Augustus P Crumhorn III.
Oliver, who rose to fame in the US on The Daily Show with Jon Stewart, said he had loved the show "my whole life".
He said: "Danger Mouse was a significant part of my childhood. So to get a chance to do it is like getting a chance to step into your childhood, which is both a magical and a potentially hazardous thing. It will be awesome, I can't wait to see it, let alone hear myself in it."
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The CBBC show features Alexander Armstrong as the voice of the world's smallest secret agent Danger Mouse, Kevin Eldon as his sidekick Penfold, Stephen Fry as Colonel K and Dave Lamb as the narrator.
The programme is to return after an absence of more than 20 years with a series on CBBC.
News of the casting was announced at Comic Con in the United States where programme makers also revealed the show would feature an appearance from spin-off character Count Duckula.Reuse content