"Chuck Versus Agent X" is the 22nd episode of the fourth season of the American action-comedy television series Chuck, and the 76th overall episode of the series. The episode was written by Phil Klemmer and Craig DiGregorio and directed by Robert Duncan McNeill. It originally aired on May 2, 2011. In the episode, Chuck Bartowski's (Zachary Levi) bachelor party turns up some uninvited guests.