The death of beloved Dr. Mark Greene devastated ER fans everywhere (including Rachael), but Anthony Edwards is back on the show for the final season to say goodbye. "We have Barack Obama as president and Dr. Greene is back from the dead -- it's all good!" says Anthony. "I was as surprised as anybody. [Executive producer] John Wells called me and said, 'This is the 15th season, we'd love to bring everybody back to the show -- we have a little bit of challenge trying to bring you back, but we think we came up with something.'" Tune in tonight to see how Dr. Greene returns to ER ... and if co-star George Clooney will show up!

While his return to the show is a huge treat for fans, Anthony explains why it was particularly special for him. "I was able to tell [the show], don't pay me -- let's do something different. Let's have Warner Brothers give to my charity," he says. The studio kicked in $125,000 for Anthony's Shoe 4 Africa organization, which is working to build the largest children's hospital in Africa. "It's 100% charity," Anthony adds. "We have no administrative costs, so if you give a dollar, the dollar goes to the hospital." Click here to find out how you can get involved.

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