Along with the story's first half, "The Stolen Earth" (#4.12), this episode has the longest opening-credits cast list of the modern series: six names (Tennant, Tate, Agyeman, Barrowman, Sladen and Piper) appear before the title instead of the usual two... in the same amount of time.
Credit at the end of "Journey's End": COMING CHRISTMAS 2008 THE RETURN OF THE CYBERMEN