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DarkUFO is now reporting that it is official. The season 4 finale is apparently going to be so monumental that the writers need three hours to tell the story. That's right, a 3-hour season finale.
The first hour will air on May 15, then the final two hours will air on May 29. Grey's Anatomy will show their 2-hour season finale on May 22 along with Ugly Betty's 1-hour finale.