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Katie Holmes is going back to her television roots! ET confirms the actress will guest star on "Eli Stone."

Stephen McPherson, President of ABC Entertainment, tells us today that Katie was fabulous! "It is great. First and foremost it is a reunion for Katie and [exec producer] Greg Berlanti. I was at the table read. She was fabulous. It is a great role for her. There is some singing and dancing she does. She is exquisite. For a show we creatively believed in and had a tough launch because of the strike, it is a great promotionally for us. Greg came to me because he had an idea. We are excited because we are shooting it over the next couple of days."

"We were talking about the beginning of the season," Greg adds. "And we wanted to bring eyeballs to the show and get people who haven't seen the show...and I said, I can go and ask Katie. I went and begged her. We talked a little bit about her role...It is not a one scene-two scene role; she has a significant role."

"Eli Stone" chronicles a San Francisco attorney who suddenly begins to see things that are not real due to a brain aneurysm. His visions lead him to accept cases that serve the greater good, rather than his pocketbook.

Katie will play a fellow attorney -- and the young mom has plenty of support on the set! Her little lady, Suri, and husband Tom Cruise were with at the studio during shooting yesterday.

We're told that the episode will air on October 21.