SPOILER ALERT: George Clooney's E.R. character DR. DOUG ROSS will return to the show as the father of twin girls.
The movie star and his TV partner Julianna Margulies will feature in E.R.'s finale, which will air in America on 2 April (09).
And the pair will be married with twins.
Margulies, who will return as Nurse Carol Hathaway, tells America's TV Guide magazine she never thought she'd be back on the show which made her a star.
She explains, "I said from the beginning I would come back if George came back. But I was pretty sure George wasnt going to come back.
"It felt as though a lifetime had happened since then... (but) nothing had happened since then... Half the crew is still there, God bless them. We were all family. It was like coming home."
But she and Clooney insisted their return to the medical drama be kept under wraps - because neither wanted to be part of a big publicity campaign.
Margulies adds, "We wanted it quiet because neither George nor I wanted to sit on talk shows getting people to watch the final episode of E.R... Its the last thing George needs. Of course the day we get there, I could see a long lens outside the Warner Bros. gate, taking pictures of us walking to the set. Nothings sacred anymore."
But she's glad she made the decision to return: "I worked with George for two days and we had an amazing time."