High Quality Content by WIKIPEDIA articles! "Arrow of Time" is the 11th episode of the fifth season of the American television show Numb3rs. In the episode, Federal Bureau of Investigation (FBI) agents track an escaped prisoner who is seeking revenge against one of their own. Written by series writer/executive producer Ken Sanzel, the episode continued two storylines. The first storyline continued one that began with two episodes shown very early in season three. The other was originally launched in the season four season finale "When Worlds Collide".