Numb3rs: Cause and Effect

"Cause and Effect" is the 16th episode and the season finale of the sixth season and series finale of the American television series Numb3rs. In the episode, Federal Bureau of Investigation (FBI) agents and mathematicians attempt to find one agent's gun before it is used in a violent crime. When series creators/executive producers Cheryl Heuton and Nicolas Falacci learned that the number of episodes airing during the season was reduced, they felt that they needed to finish storylines in case the series was cancelled. To do so, they wrote an open-ended story to serve as either a season finale or a series finale. Originally set to air in May, "Cause and Effect" first aired in the United States on March 12, 2010. Critics mostly focused on the potential cancellation of the series, but two reviewers gave the episode reviews. "Cause and Effect" became Numb3rs series finale after CBS's cancellation of the series on May 19, 2010.