"Twenty Five" is the 88th episode and the season four finale of the American television series The West Wing. The episode aired on May 14, 2003, on NBC. It takes its title from the Twenty-fifth Amendment to the United States Constitution, which deals with the presidential line of succession.

Tobias "Toby" Zachary Ziegler is a fictional character in the television serial drama The West Wing, played by Richard Schiff. The role of Toby Ziegler earned actor Richard Schiff the Primetime Emmy Award for Outstanding Supporting Actor in a Drama Series in 2000. For most of the series' duration, he is White House Communications Director. In the final season, Ziegler is involved in a storyline around a leak of classified information, which The New York Times compared to the leak investigation of the Valerie Plame affair.