Michael J. Fox, who has lived with Parkinson’s disease for almost 20 years, has a hard time not moving still because of the degenerative nerve disorder. But now, with a four-part guest spot on Rescue Me, the actor will have face the challenge of staying still to play a paralyzed, wheelchair-bound man.


"The funny part is me playing a paralyzed guy because I am the opposite of paralyzed," he tells Entertainment Tonight in an interview airing this evening. "It’s tricky just to even just to be still."


The character is a far cry from the good guys Michael usually plays on screen, which will be another stretch for the veteran actor, one he’s looking forward to.



"[Dennis Leary] called me up and described [the character]," he says. "He is really dark and misanthropic. He’s bitter and nasty. It’s really fun."


Although the beloved actor has been struggling with the disease for a long time, Michael has remained optimistic about his condition, saying he’s "pretty good all things considered," and penning Always Looking Up: The Adventures of an Incurable Optimist, due out this spring.


"If you’re never down you’ll never know how good it feels to be up," he tells ET. "It’s a great ride and I wouldn’t change a thing. I love my life for whatever difficulties there are."


Tune in to ET tonight for more!