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As director and star of new movie The Midnight Sky, George Clooney faced a dilemma with having to show a younger version of his character in flashback scenes.

Instead of using a digital double or being made up to look younger, he hired 34-year-old actor Ethan Peck to play the part – but while Peck bore a physical resemblance to Clooney, 59, there remained the problem of how to make the characters speak in the same voice.

So Peck’s dialogue was electronically altered using artificial intelligence techniques.

By electronically combining his lines with a reading of the same words by Clooney, the result sounded like a believable younger version of the character.

The film, also starring Felicity Jones, sees Clooney playing a dying astrophysicist in an Arctic research station who reflects on his life while trying to save the future of mankind.