07/16/2008 AT 12:00 AM EDT
is heading back to TV -- for a guest role on ABC's Eli Stone
Holmes is slated to appear in an episode of the legal comedy-drama on Oct. 21. She'll play a non-profit attorney whose mysterious case leads her to Eli (Jonny Lee Miller
). Eli Stone
executive producer Greg Berlanti
and Holmes previously collaborated on long-running teen favorite Dawson's Creek
, in which Holmes played Joey Potter.
"We wanted to do anything we could to get talking about the show. I went and begged her," Berlanti said of Holmes. "She said 'I'd love to.'"
Holmes began filming Tuesday. "She's singing and dancing," Berlanti says of the musical show. "But we want to keep an element of mystery for the audience." Tom Cruise
and daughter Suri were spotted on the show's set
earlier this week, which may have sparked rumors that Cruise would be appearing on the show. Not true, says a source.
The casting of Holmes was first reported by Entertainment Weekly
This fall, Holmes will also make her Broadway debut. She'll appear six nights a week in a revival of Arthur Miller
's All My Sons
, alongside John Lithgow
, Dianne Wiest
, and Patrick Wilson
in New York City. -- Shreya Baxi and Liza Hamm