Edited sentence: " An aircraft is seen blowing up a building, most likely the U.And several more helicopters and a floatation boat are seen coming in carrying Mike Doyle and Josh Bauer to an unidentified building.It is revealed in the preview for these two back to back episodes that Bill Buchanan will return.It seems Jack Bauer has also followed a lead on Cheng Zhi in order to find Josh, but Cheng says "You are too late.Military Base everyone at the White House had feared would be attacked by the Russians, and Jack is jumping away from the blast.Morris O'Brian is seen yelling for help as he holds Chloe O'Brian in his arms, who appears to be injured.This is also the back to back episode that features the return of a popular "24" character who for some has not been indentified