LOST star Matthew Fox has been sworn to secrecy about the hit show's plot - as he's the only castmember who knows how the series will end.

The actor, who plays Dr. Jack Shephard in the show, admits his fellow stars hope he'll tell them what happens in the final episodes, which are set to be aired on TV in 2010.

But Fox insists he will never reveal the plot - because he enjoys keeping his special secret.

He says, "Yes, it's true. They understand I can't talk about it, but sometimes they'll ask, just hoping I'll blurt it out. Besides, having a secret is fun." (JC/WNSMIS/MT)

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