Michael J. Fox is set to star in a new "Back To The Future" time-travelling movie.
The actor, who suffers from Parkinson's disease, wants to make a fourth and final film of the much-loved series.
But the 44-year-old star has several conditions - that movie bosses makes his character as old as he is in real life and he stars as eccentric scientist Doc Brown - formerly played by Christopher Lloyd.
He told website Moviehole.net, "The only way it would work would be if I played Doc. I'm 44-years-old now and I'm not interested in running around on skateboards! I think after 1, 2 and 3 we all kind of felt we had done it. And I think if they did it again now they would do it with a younger cast and justdo a different realisation of it, which would be fun."
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