Almost Undercover as Vaughn Tom and Twink Tucker is the cold open from the Season Two episode, The Road Trip.
A cold open is a term used in television for the part of a show that jumps directly into a joke or story at the beginning, before the opening credits are shown.
Synopsis
Jake Peralta and Charles Boyle are reporting to Raymond Holt about their detailed undercover disguises as Vaughn Tom and Twink Tucker. Terry Jeffords stops by to report the suspects they were going undercover to catch turned themselves in. Seeing how deflated the two were about not getting to use their disguises, Holt gives them 10 minutes to make use of them.