High Quality Content by WIKIPEDIA articles! "Training Day" is the twentieth episode of the seventh season of the American comedy television series The Office and the shows 146th episode overall. It originally aired on the National Broadcasting Company (NBC) on April 14, 2011. The episode was written by Daniel Chun and directed by Paul Lieberstein. This episode marks the first appearance of Deangelo Vickers (Will Ferrell) in the series.