Michael J. Fox isn't going to let Parkinson's disease get in the way of what he loves: Acting.

The actor makes his first appearance ever on "The Ellen DeGeneres Show" today, where he revealed why he decided to return to television full time with a new show coming to NBC fall 2013.

"It's been a while, but I did 'The Good Wife' and I did 'Curb Your Enthusiasm,' Fox says of his recent acting roles ... both of which garnered him Emmy nominations.

"And I was just sitting around thinking, like I always say live in the moment. Enjoy the day. Make the most of what you have," he adds. "And I thought, well, if I put one day after another where it's like that, why not just do what I love to do: Work."

NBC reportedly picked up 22 episodes of the show without even seeing a pilot.

"It's a big leap of faith, but we're going to live up to it," Fox says of the show -- which will chronicle a father of three who is "dealing with family, career and challenges — including Parkinson’s — all loosely drawn from Fox’s real life."

On the episode, Ellen also had Michael sign a Gibson guitar similar to the one he played in "Back to the Future."

The guitar will be signed by all the musical guests on her show this season and then be auctioned off to raise money for the Michael J. Fox Foundation for Parkinson’s disease.

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