Clooney returns as 'ER' nears end

George Clooney led a parade of old favourites back to 'ER' as the medical drama nears the end of its 15-year run.

Clooney, who left the show in 1999 to pursue movie stardom, reprised his character Dr Doug Ross.

Now in Seattle, Ross works with wife Carol Hathaway (Julianna Margulies) to persuade a grandmother played by Susan Sarandon to donate the organs of her grandson.

One of those organs, the kidney, went to “some doctor in Chicago,” Hathaway said.

Neither she nor Ross knew the transplant patient was their old colleague John Carter, played by fellow 'ER' original Noah Wyle.

The finale of the drama is scheduled to air April 2 in the US.