Rosie O'Donnell will make a surprise return to Drop Dead Diva on Sunday, TVGuide.com has learned exclusively.

O'Donnell will reprise her role as Judge Madeline Summers "in a very, very unusual way," executive producer Josh Berman tells TVGuide.com.

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In the episode, Judge Summers will lend a hand to a desperate Jane (Brooke Elliot) in an effort to save her client, but the details of O'Donnell's appearance have been kept top secret.  

O'Donnell, 48, will also be returning to daytime television via Oprah Winfrey's OWN Network with a new talk show set to debut next year.