Speaking to CultBox to promote ITV1’s recent two-part psychological thriller Case Sensitive, which aired last week, Williams praised her co-star: “He’s fantastic. It’s slightly irritating, I was hoping he’d be an American TV actor who’d never done a stage play and he’d be rubbish and make me look really good. Then he turned up and he’s a complete natural on the stage.”

She added: “He’s got a phenomenal different voice, completely different from Dr Jack Shepherd on Lost, physically strong. He plays it really tough, he’s like A Streetcar Named Desire, he reminds me of early Brando.”

Discussing Lost, the London-born Dollhouse star also mentioned that she nearly appeared in the show herself: “You’re probably better at watching these very mysterious shows than me, but I’m afraid I lost the plot with Lost. I did audition for it actually, I was nearly in it! Matthew alleges that he knows who I would’ve played, but my husband said he doesn’t like golf or swimming so he’s glad he didn’t have to live in Hawaii for six years.”

Based on the psychological suspense novel Point Of Rescue by Sophie Hannah, Case Sensitive is available to watch now on ITV Player.

> Order the Case Sensitive DVD on Amazon.

Matthew Fox and Olivia Williams will be appearing as brother and sister together in A Forest Dark And Deep until Saturday 4th June.